[数学20以内加减法分解算法习题]

9加几 例：9 + 4 = 13 1 3 10 9 + 5 = 1 10 9 + 6 = 1 10 9 + 7 = 1 10 9 + 8 = 1 10 9 + 9 = 1 10 9 + 2 = 1 10 9 + 3 = 1 10 8、7、6加几 例：8 + 4 = 12 2 2 10 7 + 4 = 11 3 1 10 6 + 5 = 11 4 1 10 8 + 3 = 2 10 8 + 4 = 2 10 8 + 5 = 2 10 8 + 6 = 2 10 8 + 7 = 2 10 8 + 8 = 2 10 8 + 9 = 2 10 7 + 9 = 3 10 7 + 6 = 3 10 7 + 8 = 3 10 7 + 5 = 3 10 7 + 7 = 3 10 7 + 4 = 3 10 6 + 9 = 3 10 6 + 6 = 3 10 6 + 8 = 3 10 6 + 5 = 3 10 6 + 7 = 3 10 十几减9 15 - 9 = 6 5 10 1 16 - 9 = 10 18 - 9 = 10 17 - 9 = 10 15 - 9 = 10 14 - 9 = 10 12 - 9 = 10 11 - 9 = 10 十几减8、7、6 16 - 8 = 8 6 10 2 15 - 7 = 8 5 10 3 14 - 6 = 8 4 10 4 14 - 8 = 10 15 - 8 = 10 13 - 8 = 10 17 - 8 = 10 12 - 8 = 10 11 - 8 = 10 15 - 7 = 10 13 - 7 = 10 14 - 7 = 10 12 - 7 = 10 11 - 7 = 10 15 - 6 = 10 13 - 6 = 10 14 - 6 = 10 12 - 6 = 10 11 - 6 = 10