{"id":808,"date":"2026-07-27T12:11:50","date_gmt":"2026-07-27T03:11:50","guid":{"rendered":"https:\/\/www.risu-japan.com\/drill\/?p=808"},"modified":"2026-07-27T12:11:50","modified_gmt":"2026-07-27T03:11:50","slug":"estimation-rounding-calculation","status":"publish","type":"drill","link":"https:\/\/www.risu-japan.com\/drill\/grade3\/written-calc-add-sub\/estimation-rounding-calculation\/","title":{"rendered":"3\u30fb4\u30b1\u30bf\u306e\u52a0\u6e1b\u8a08\u7b97\u306e\u7d50\u679c\u306e\u898b\u7a4d\u3082\u308a"},"content":{"rendered":"<p><!-- body-start --><\/p>\n<h2>\u8a08\u7b97\u306e\u7d50\u679c\u306e\u898b\u7a4d\u3082\u308a\u3068\u306f<\/h2>\n<p>\u8cb7\u3044\u7269\u306b\u884c\u304f\u3068\u304d\u3084\u3001\u5927\u304d\u306a\u6570\u306e\u8a08\u7b97\u304c\u5408\u3063\u3066\u3044\u308b\u304b\u78ba\u304b\u3081\u308b\u3068\u304d\u3001\u6b63\u78ba\u306a\u7b54\u3048\u3067\u306f\u306a\u304f\u300c\u3060\u3044\u305f\u3044\u3069\u308c\u304f\u3089\u3044\u304b\u300d\u304c\u5206\u304b\u308c\u3070\u5341\u5206\u306a\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u3001\u6570\u3092\u30ad\u30ea\u306e\u826f\u3044\u300c\u304a\u3088\u305d\u306e\u6570\uff08\u6982\u6570\uff09\u300d\u306b\u3057\u3066\u304b\u3089\u8a08\u7b97\u3057\u3001\u3060\u3044\u305f\u3044\u306e\u7b54\u3048\u3092\u4e88\u6e2c\u3059\u308b\u3053\u3068\u3092\u300c\u7d50\u679c\u306e\u898b\u7a4d\u3082\u308a\u300d\u3068\u8a00\u3044\u307e\u3059\u3002\u898b\u7a4d\u3082\u308a\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u300c<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>398<\/mn><mo>+<\/mo><mn>415<\/mn><\/math><\/span>\u300d\u3092\u300c<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>400<\/mn><mo>+<\/mo><mn>400<\/mn><\/math><\/span>\u300d\u306e\u3088\u3046\u306b\u982d\u306e\u4e2d\u3067\u7d20\u65e9\u304f\u8a08\u7b97\u3067\u304d\u3001\u8a08\u7b97\u9593\u9055\u3044\uff08\u6841\u306e\u30ba\u30ec\u306a\u3069\uff09\u306b\u3082\u3059\u3050\u306b\u6c17\u3065\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u898b\u7a4d\u3082\u308a\u306e \u30eb\u30fc\u30eb<\/h2>\n<h3>1. \u6982\u6570\uff08\u304a\u3088\u305d\u306e\u6570\uff09\u306b\u3059\u308b<\/h3>\n<p>\u8a08\u7b97\u3059\u308b\u524d\u306b\u3001\u305d\u308c\u305e\u308c\u306e\u6570\u3092\u300c\u4e0a\u304b\u30891\u30b1\u30bf\u300d\u3084\u300c\u4e0a\u304b\u30892\u30b1\u30bf\u300d\u306a\u3069\u306e\u6982\u6570\u306b\u3057\u307e\u3059\u3002\u57fa\u672c\u7684\u306b\u306f\u3001\u4e00\u756a\u5927\u304d\u3044\u4f4d\u306e1\u3064\u4e0b\u306e\u4f4d\u3092\u300c\u56db\u6368\u4e94\u5165\uff08\u3057\u3057\u3083\u3054\u306b\u3085\u3046\uff09\u300d\u3057\u307e\u3059\u3002\uff08\u4f8b\uff1a<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>398<\/mn><mo>\u2192<\/mo><\/math><\/span> \u5341\u306e\u4f4d\u306e\u300c9\u300d\u3092\u5207\u308a\u4e0a\u3052\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>400<\/mn><\/math><\/span>\u3002<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4120<\/mn><mo>\u2192<\/mo><\/math><\/span> \u767e\u306e\u4f4d\u306e\u300c1\u300d\u3092\u5207\u308a\u6368\u3066\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4000<\/mn><\/math><\/span>\uff09<\/p>\n<h3>2. \u8a08\u7b97\u3059\u308b<\/h3>\n<p>\u30ad\u30ea\u306e\u826f\u3044\u6570\u306b\u306a\u3063\u305f\u3089\u3001\u305f\u3057\u7b97\u3084\u3072\u304d\u7b97\u3092\u3057\u307e\u3059\u3002<\/p>\n<h3>3. \u300c\u7d04\u300d\u3092\u3064\u3051\u308b<\/h3>\n<p>\u898b\u7a4d\u3082\u3063\u305f\u7b54\u3048\u306b\u306f\u3001\u3060\u3044\u305f\u3044\u306e\u6570\u3067\u3042\u308b\u3053\u3068\u3092\u8868\u3059\u300c\u7d04\u300d\u3092\u3064\u3051\u3066\u7b54\u3048\u307e\u3059\u3002\uff08\u4f8b\uff1a\u7d04 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>800<\/mn><\/math><\/span>\uff09<\/p>\n<p><!-- \u4f8b\u984c --><\/p>\n<section class=\"example-section\">\n<h2 class=\"example-section__heading\">\u4f8b\u984c<\/h2>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f1<\/h3>\n<p><span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>398<\/mn><\/math><\/span> \u5186\u306e \u308a\u3093\u3054\u3068\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>415<\/mn><\/math><\/span> \u5186\u306e \u3076\u3069\u3046\u3092 \u8cb7\u3044\u307e\u3059\u3002\u4ee3\u91d1\u306f \u3060\u3044\u305f\u3044 \u4f55\u5186\u306b \u306a\u308a\u307e\u3059\u304b\u3002\u305d\u308c\u305e\u308c \u4e0a\u304b\u3089 1\u30b1\u30bf\u306e \u6982\u6570\u306b \u3057\u3066 \u898b\u7a4d\u3082\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/p><\/div>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f2<\/h3>\n<p><span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>1000<\/mn><\/math><\/span> \u5186\u3092 \u6301\u3063\u3066 \u8cb7\u3044\u7269\u306b \u884c\u304d\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>480<\/mn><\/math><\/span> \u5186\u306e \u30b1\u30fc\u30ad\u3092 \u8cb7\u3044\u307e\u3059\u3002\u304a\u91e3\u308a\u306f \u3060\u3044\u305f\u3044 \u4f55\u5186\u306b \u306a\u308a\u307e\u3059\u304b\u3002<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>480<\/mn><\/math><\/span> \u3092 \u767e\u306e\u4f4d\u307e\u3067\u306e \u6982\u6570\u306b \u3057\u3066 \u898b\u7a4d\u3082\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/p><\/div>\n<div class=\"explanation-block\">\n<h3 class=\"explanation-block__heading\">\u89e3\u8aac<\/h3>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f1<\/h4>\n<p>\u308a\u3093\u3054\u306e\u5024\u6bb5\u3092\u56db\u6368\u4e94\u5165\u3059\u308b\u3068\u5341\u306e\u4f4d\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>9<\/mn><\/math><\/span> \u3092\u5207\u308a\u4e0a\u3052\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>400<\/mn><\/math><\/span> \u5186\u306b\u306a\u308a\u307e\u3059\u3002\u3076\u3069\u3046\u306e\u5024\u6bb5\u3092\u56db\u6368\u4e94\u5165\u3059\u308b\u3068\u5341\u306e\u4f4d\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>1<\/mn><\/math><\/span> \u3092\u5207\u308a\u6368\u3066\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>400<\/mn><\/math><\/span> \u5186\u306b\u306a\u308a\u307e\u3059\u3002\u308a\u3093\u3054\u3068\u3076\u3069\u3046\u3092\u5408\u308f\u305b\u305f\u4ee3\u91d1\u3092\u6c42\u3081\u308b\u306e\u3067\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>400<\/mn><mo>+<\/mo><mn>400<\/mn><\/math><\/span> \u3092\u3057\u3066\u7b54\u3048\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>800<\/mn><\/math><\/span> \u5186\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a\u7d04800\u5186\u3001<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mn>400<\/mn><mo>+<\/mo><mn>400<\/mn><mo>=<\/mo><mn>800<\/mn><\/math><\/div>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f2<\/h4>\n<p><span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>480<\/mn><\/math><\/span> \u3092\u767e\u306e\u4f4d\u307e\u3067\u306e\u6982\u6570\u306b\u3059\u308b\u305f\u3081\u306b\u56db\u6368\u4e94\u5165\u3059\u308b\u3068\u5341\u306e\u4f4d\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>8<\/mn><\/math><\/span> \u3092\u5207\u308a\u4e0a\u3052\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>500<\/mn><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>1000<\/mn><\/math><\/span> \u5186\u304b\u3089\u30b1\u30fc\u30ad\u306e\u5024\u6bb5\u3092\u5f15\u3044\u305f\u304a\u91e3\u308a\u3092\u6c42\u3081\u308b\u306e\u3067\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>1000<\/mn><mo>&#8211;<\/mo><mn>500<\/mn><\/math><\/span> \u3092\u3057\u3066\u7b54\u3048\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>500<\/mn><\/math><\/span> \u5186\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a\u7d04500\u5186\u3001<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mn>1000<\/mn><mo>&#8211;<\/mo><mn>500<\/mn><mo>=<\/mo><mn>500<\/mn><\/math><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n<p><!-- \u7df4\u7fd2\u554f\u984c --><\/p>\n<section class=\"practice-problems\">\n<h2>\u7df4\u7fd2\u554f\u984c<\/h2>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f1<\/h3>\n<p>\u6b21\u306e \u8a08\u7b97\u306e \u7b54\u3048\u306f \u3060\u3044\u305f\u3044 \u3069\u308c\u304f\u3089\u3044\u306b \u306a\u308a\u307e\u3059\u304b\u3002\u305d\u308c\u305e\u308c \u5343\u306e\u4f4d\u307e\u3067\u306e \u6982\u6570\u306b \u3057\u3066 \u898b\u7a4d\u3082\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mn>2950<\/mn><mo>+<\/mo><mn>4120<\/mn><mo>=<\/mo><\/math><\/div>\n<\/p><\/div>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f2<\/h3>\n<p>\u6b21\u306e \u8a08\u7b97\u306e \u7b54\u3048\u306f \u3060\u3044\u305f\u3044 \u3069\u308c\u304f\u3089\u3044\u306b \u306a\u308a\u307e\u3059\u304b\u3002\u305d\u308c\u305e\u308c \u4e0a\u304b\u3089 1\u30b1\u30bf\u306e \u6982\u6570\u306b \u3057\u3066 \u898b\u7a4d\u3082\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mn>820<\/mn><mo>&#8211;<\/mo><mn>390<\/mn><mo>=<\/mo><\/math><\/div>\n<\/p><\/div>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f3<\/h3>\n<p>\u300c<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>815<\/mn><mo>&#8211;<\/mo><mn>389<\/mn><\/math><\/span>\u300d\u3092 \u898b\u7a4d\u3082\u308b \u305f\u3081\u306b\u300c<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>800<\/mn><mo>&#8211;<\/mo><mn>400<\/mn><\/math><\/span>\u300d\u3068\u3044\u3046 \u5f0f\u3092 \u4f5c\u308a\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u3001\u3069\u306e\u4f4d\u3067 \u56db\u6368\u4e94\u5165 \u3057\u307e\u3057\u305f\u304b\u3002<\/p>\n<\/p><\/div>\n<\/section>\n<p><!-- \u5fdc\u7528\u554f\u984c --><\/p>\n<section class=\"advanced-problems\">\n<h2>\u5fdc\u7528\u554f\u984c<\/h2>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f1<\/h3>\n<p>A\u3055\u3093\u306f\u3001\u300c<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>398<\/mn><mo>+<\/mo><mn>415<\/mn><\/math><\/span>\u300d\u306e \u8a08\u7b97\u3092 \u3057\u3066\u300c<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>1213<\/mn><\/math><\/span>\u300d\u3068\u3044\u3046 \u7b54\u3048\u3092 \u51fa\u3057\u307e\u3057\u305f\u3002\u3053\u306e \u7b54\u3048\u304c \u9593\u9055\u3063\u3066 \u3044\u308b\u3053\u3068\u3092\u3001\u898b\u7a4d\u3082\u308a\u3092 \u4f7f\u3063\u3066 \u8aac\u660e\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/p><\/div>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f2<\/h3>\n<p><span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>1000<\/mn><\/math><\/span> \u5186\u3092 \u6301\u3063\u3066 \u3044\u307e\u3059\u3002<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>380<\/mn><\/math><\/span> \u5186\u306e \u304a\u83d3\u5b50\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>190<\/mn><\/math><\/span> \u5186\u306e \u30b8\u30e5\u30fc\u30b9\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>210<\/mn><\/math><\/span> \u5186\u306e \u30d1\u30f3\u3092 \u5168\u90e8 \u8cb7\u3046 \u3053\u3068\u306f \u3067\u304d\u307e\u3059\u304b\u3002\u305d\u308c\u305e\u308c \u4e0a\u304b\u3089 1\u30b1\u30bf\u306e \u6982\u6570\u306b \u3057\u3066 \u898b\u7a4d\u3082\u308a\u3001\u7406\u7531\u3082 \u3042\u308f\u305b\u3066 \u66f8\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/p><\/div>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f3<\/h3>\n<p>\u300c<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>2480<\/mn><mo>+<\/mo><mn>1530<\/mn><\/math><\/span>\u300d\u3092 \u898b\u7a4d\u3082\u308a\u307e\u3059\u3002\u2460\u5343\u306e\u4f4d\u307e\u3067\u306e \u6982\u6570\uff08\u4e0a\u304b\u30891\u30b1\u30bf\uff09\u306b \u3057\u3066 \u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002\u2461\u767e\u306e\u4f4d\u307e\u3067\u306e \u6982\u6570\uff08\u4e0a\u304b\u30892\u30b1\u30bf\uff09\u306b \u3057\u3066 \u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002\u5b9f\u969b\u306e \u7b54\u3048\uff08<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4010<\/mn><\/math><\/span>\uff09\u306b \u8fd1\u304f \u306a\u308b\u306e\u306f\u3001\u2460\u3068\u2461\u306e \u3069\u3061\u3089 \u3067\u3059\u304b\u3002<\/p>\n<\/p><\/div>\n<\/section>\n<p><!-- \u89e3\u7b54\u3068\u89e3\u8aac --><\/p>\n<section class=\"answer-section\">\n<h2>\u89e3\u7b54\u3068\u89e3\u8aac<\/h2>\n<div class=\"answer-group answer-group--practice\">\n<h3>\u7df4\u7fd2\u554f\u984c<\/h3>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f1<\/h4>\n<p><span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>2950<\/mn><\/math><\/span> \u3092\u5343\u306e\u4f4d\u307e\u3067\u306e\u6982\u6570\u306b\u3059\u308b\u3068\u767e\u306e\u4f4d\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>9<\/mn><\/math><\/span> \u3092\u5207\u308a\u4e0a\u3052\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>3000<\/mn><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4120<\/mn><\/math><\/span> \u3092\u5343\u306e\u4f4d\u307e\u3067\u306e\u6982\u6570\u306b\u3059\u308b\u3068\u767e\u306e\u4f4d\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>1<\/mn><\/math><\/span> \u3092\u5207\u308a\u6368\u3066\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4000<\/mn><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>3000<\/mn><mo>+<\/mo><mn>4000<\/mn><\/math><\/span> \u3092\u3059\u308b\u3068\u3001\u7b54\u3048\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>7000<\/mn><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a\u7d047000\u3001<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mn>3000<\/mn><mo>+<\/mo><mn>4000<\/mn><mo>=<\/mo><mn>7000<\/mn><\/math><\/div>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f2<\/h4>\n<p><span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>820<\/mn><\/math><\/span> \u3092\u4e0a\u304b\u30891\u30b1\u30bf\u306e\u6982\u6570\u306b\u3059\u308b\u3068\u5341\u306e\u4f4d\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>2<\/mn><\/math><\/span> \u3092\u5207\u308a\u6368\u3066\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>800<\/mn><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>390<\/mn><\/math><\/span> \u3092\u4e0a\u304b\u30891\u30b1\u30bf\u306e\u6982\u6570\u306b\u3059\u308b\u3068\u5341\u306e\u4f4d\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>9<\/mn><\/math><\/span> \u3092\u5207\u308a\u4e0a\u3052\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>400<\/mn><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>800<\/mn><mo>&#8211;<\/mo><mn>400<\/mn><\/math><\/span> \u3092\u3059\u308b\u3068\u3001\u7b54\u3048\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>400<\/mn><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a\u7d04400\u3001<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mn>800<\/mn><mo>&#8211;<\/mo><mn>400<\/mn><mo>=<\/mo><mn>400<\/mn><\/math><\/div>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f3<\/h4>\n<p><span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>815<\/mn><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>389<\/mn><\/math><\/span> \u304c\u56db\u6368\u4e94\u5165\u3067 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>800<\/mn><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>400<\/mn><\/math><\/span> \u3068\u3044\u3046\u4e0a\u304b\u30891\u30b1\u30bf\u306e\u6982\u6570\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u4e0a\u304b\u30892\u30b1\u30bf\u76ee\u306e\u5341\u306e\u4f4d\u3067\u56db\u6368\u4e94\u5165\u3057\u305f\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a\u5341\u306e\u4f4d<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"answer-group answer-group--advanced\">\n<h3>\u5fdc\u7528\u554f\u984c<\/h3>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f1<\/h4>\n<p><span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>398<\/mn><mo>+<\/mo><mn>415<\/mn><\/math><\/span> \u3092\u4e0a\u304b\u30891\u6841\u306e\u6982\u6570\u306b\u3057\u3066\u8a08\u7b97\u3059\u308b\u3068\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>400<\/mn><mo>+<\/mo><mn>400<\/mn><\/math><\/span> \u3092\u3057\u3066\u7b54\u3048\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>800<\/mn><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u3068\u304d\u56db\u6368\u4e94\u5165\u3059\u308b\u524d\u306e\u305f\u3057\u7b97\u304c <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>900<\/mn><\/math><\/span> \u4ee5\u4e0a\u306b\u306a\u308b\u3053\u3068\u306f\u306a\u3044\u306e\u3067\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>1213<\/mn><\/math><\/span> \u3068\u3044\u3046\u7b54\u3048\u306f\u9593\u9055\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a\u4e0a\u304b\u30891\u30b1\u30bf\u306e\u6982\u6570\u306b\u56db\u6368\u4e94\u5165\u3057\u3066\u8a08\u7b97\u3059\u308b\u3068800\u306b\u306a\u308b\u304b\u3089\u9593\u9055\u3063\u3066\u3044\u308b\u3001<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mn>400<\/mn><mo>+<\/mo><mn>400<\/mn><mo>=<\/mo><mn>800<\/mn><\/math><\/div>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f2<\/h4>\n<p>\u304a\u83d3\u5b50\u3068\u30b8\u30e5\u30fc\u30b9\u3068\u30d1\u30f3\u306e\u5024\u6bb5\u3092\u305d\u308c\u305e\u308c\u4e0a\u304b\u30891\u6841\u306e\u6982\u6570\u306b\u3059\u308b\u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>400<\/mn><\/math><\/span> \u5186\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>200<\/mn><\/math><\/span> \u5186\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>200<\/mn><\/math><\/span> \u5186\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e3\u3064\u306e\u5024\u6bb5\u3092\u8db3\u3057\u5408\u308f\u305b\u308b\u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>800<\/mn><\/math><\/span> \u5186\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u3068\u304d\u5b9f\u969b\u306e\u5024\u6bb5\u306e\u5408\u8a08\u304c <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>950<\/mn><\/math><\/span> \u5186\u4ee5\u4e0a\u306b\u306a\u308b\u3053\u3068\u306f\u306a\u3044\u306e\u3067\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>1000<\/mn><\/math><\/span> \u5186\u6301\u3063\u3066\u3044\u308b\u3068\u8cb7\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a\u4e0a\u304b\u30891\u30b1\u30bf\u306e\u6982\u6570\u306b\u3057\u3066\u304a\u83d3\u5b50\u3068\u30b8\u30e5\u30fc\u30b9\u3068\u30d1\u30f3\u306e\u5024\u6bb5\u3092\u8db3\u3057\u5408\u308f\u305b\u308b\u3068800\u5186\u306b\u306a\u308b\u306e\u3067\u8cb7\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u3001<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mn>400<\/mn><mo>+<\/mo><mn>200<\/mn><mo>+<\/mo><mn>200<\/mn><mo>=<\/mo><mn>800<\/mn><\/math><\/div>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f3<\/h4>\n<p>\u307e\u305a\u3001\u5343\u306e\u4f4d\u307e\u3067\u306e\u6982\u6570\u306b\u3057\u3066\u8a08\u7b97\u3059\u308b\u3068\u3001\u5f0f\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>2000<\/mn><mo>+<\/mo><mn>2000<\/mn><\/math><\/span> \u3068\u306a\u3063\u3066\u7b54\u3048\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4000<\/mn><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002\u6b21\u306b\u3001\u767e\u306e\u4f4d\u307e\u3067\u306e\u6982\u6570\u306b\u3057\u3066\u8a08\u7b97\u3059\u308b\u3068\u3001\u5f0f\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>2500<\/mn><mo>+<\/mo><mn>1500<\/mn><\/math><\/span> \u3068\u306a\u3063\u3066\u7b54\u3048\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4000<\/mn><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002\u4e8c\u3064\u306e\u7b54\u3048\u3092\u6bd4\u3079\u308b\u3068\u4e21\u65b9\u540c\u3058\u6570\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a\u4e21\u65b9\u540c\u3058\u6570\u306b\u306a\u308b\u3001<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mn>2000<\/mn><mo>+<\/mo><mn>2000<\/mn><mo>=<\/mo><mn>4000<\/mn><mi>\u3001<\/mi><mn>2500<\/mn><mo>+<\/mo><mn>1500<\/mn><mo>=<\/mo><mn>4000<\/mn><\/math><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n<p><!-- \u5b66\u7fd2\u306e\u30a2\u30c9\u30d0\u30a4\u30b9 --><\/p>\n<aside class=\"advice-box\">\n<h2 class=\"advice-box__heading\">\u5b66\u7fd2\u306e\u30a2\u30c9\u30d0\u30a4\u30b9<\/h2>\n<div 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