かけ算28の段(28の倍数)

28の倍数は7の倍数でもあり、4の倍数でもあります。

28 × 1 = 28 28 × 2 = 56 28 × 3 = 84 28 × 4 = 112 28 × 5 = 140 28 × 6 = 168 28 × 7 = 196 28 × 8 = 224 28 × 9 = 252 28 × 10 = 280 28 × 11 = 308 28 × 12 = 336 28 × 13 = 364 28 × 14 = 392 28 × 15 = 420 28 × 16 = 448 28 × 17 = 476 28 × 18 = 504 28 × 19 = 532 28 × 20 = 560 28 × 21 = 588 28 × 22 = 616 28 × 23 = 644 28 × 24 = 672 28 × 25 = 700 28 × 26 = 728 28 × 27 = 756 28 × 28 = 784 28 × 29 = 812 28 × 30 = 840

28×9までは覚えると便利です。