{"id":278,"date":"2026-05-25T16:25:30","date_gmt":"2026-05-25T07:25:30","guid":{"rendered":"https:\/\/www.risu-japan.com\/drill\/?p=278"},"modified":"2026-05-25T16:25:30","modified_gmt":"2026-05-25T07:25:30","slug":"two-digit-plus-minus-one-digit","status":"publish","type":"drill","link":"https:\/\/www.risu-japan.com\/drill\/grade1\/calculation-to-100\/two-digit-plus-minus-one-digit\/","title":{"rendered":"2\u30b1\u30bf\uff0b1\u30b1\u30bf\u30fb2\u30b1\u30bf\u22121\u30b1\u30bf\uff08\u304f\u308a\u4e0a\u304c\u308a\u306a\u3057\uff09"},"content":{"rendered":"<p><!-- body-start --><\/p>\n<h2>2\u30b1\u30bf\uff0b1\u30b1\u30bf\u30fb2\u30b1\u30bf\uff0d1\u30b1\u30bf\uff08\u304f\u308a\u4e0a\u304c\u308a\u306a\u3057\uff09\u3068\u306f\u306a\u306b\u304b<\/h2>\n<p>\u300c<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>23<\/mn><mo>+<\/mo><mn>4<\/mn><\/math><\/span>\u300d\u306e\u3088\u3046\u306a\u8a08\u7b97\u306f\u3001\u300c10\u306e\u307e\u3068\u307e\u308a\uff08\u5341\u306e\u4f4d\uff09\u300d\u3068\u300c1\u304c\u3044\u304f\u3064\u3042\u308b\u304b\uff08\u4e00\u306e\u4f4d\uff09\u300d\u306b\u5206\u3051\u3066\u8003\u3048\u307e\u3059\u3002\u300c10\u306e\u307e\u3068\u307e\u308a\u300d\u306f\u305d\u306e\u307e\u307e\u306b\u3057\u3066\u304a\u304d\u3001\u300c1\u306e\u6570\u300d\u540c\u58eb\u3092\u8db3\u3057\u305f\u308a\u5f15\u3044\u305f\u308a\u3057\u307e\u3057\u3087\u3046\u3002\u304f\u308a\u4e0a\u304c\u308a\u3084\u304f\u308a\u4e0b\u304c\u308a\u304c\u306a\u3044\u305f\u3081\u3001\u300c1\u306e\u6570\u300d\u306e\u8a08\u7b97\u306f\u5fc5\u305a10\u3088\u308a\u5c0f\u3055\u304f\uff08\u5f15\u304f\u5834\u5408\u306f0\u4ee5\u4e0a\u306b\uff09\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>2\u30b1\u30bf\u00b11\u30b1\u30bf\u306e\u30eb\u30fc\u30eb<\/h2>\n<p>\u300c1\u306e\u6570\uff08\u4e00\u306e\u4f4d\uff09\u300d\u3060\u3051\u3092\u8a08\u7b97\u3057\u3001\u300c10\u306e\u307e\u3068\u307e\u308a\uff08\u5341\u306e\u4f4d\uff09\u300d\u306f\u305d\u306e\u307e\u307e\u66f8\u304d\u5199\u3057\u307e\u3059\u3002<\/p>\n<h3>1. 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xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>24<\/mn><mo>+<\/mo><mn>5<\/mn><mo>=<\/mo><mn>29<\/mn><\/math><\/span><\/p>\n<p>\u300c24\u300d\u3092\u300c10\u306e\u307e\u3068\u307e\u308a\uff0820\uff09\u300d\u3068\u300c1\u306e\u6570\uff084\uff09\u300d\u306b\u5206\u3051\u3066\u8003\u3048\u307e\u3059\u3002\u307e\u305a\u4e00\u306e\u6570\u3067\u3042\u308b\u300c4\u300d\u3068\u300c5\u300d\u3092\u8db3\u3057\u7b97\u3059\u308b\u3068<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4<\/mn><mo>+<\/mo><mn>5<\/mn><mo>=<\/mo><mn>9<\/mn><\/math><\/span>\u306b\u306a\u308a\u307e\u3059\u306d\u300210\u306e\u307e\u3068\u307e\u308a\u306e\u300c20\u300d\u306f\u305d\u306e\u307e\u307e\u306b\u3057\u3066\u300c9\u300d\u3068\u3042\u308f\u305b\u308b\u306e\u3067\u3001\u7b54\u3048\u306f\u300c29\u300d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 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display=\"inline\"><mn>9<\/mn><mo>&#8211;<\/mo><mn>4<\/mn><mo>=<\/mo><mn>5<\/mn><\/math><\/span>\u306b\u306a\u308a\u307e\u3059\u300210\u306e\u307e\u3068\u307e\u308a\u306e\u300c30\u300d\u306f\u305d\u306e\u307e\u307e\u6b8b\u3057\u3066\u304a\u304f\u306e\u3067\u300c5\u300d\u3068\u3042\u308f\u305b\u3066\u3001\u7b54\u3048\u306f\u300c35\u300d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\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>\u3064\u304e\u306e \u3051\u3044\u3055\u3093\u3092 \u3057\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>12<\/mn><mo>+<\/mo><mn>3<\/mn><mo>=<\/mo><\/math><\/div>\n<\/p><\/div>\n<div class=\"problem-card\">\n<h3 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