凑十法-破十法-借十法-练习题

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【练习题. 二】（破十法）

18 – 9 = 17 – 9 = 16 – 9 = 15 – 9 = 11 – 4=

14 – 9 = 13 – 9 = 12 – 9 = 11 – 9 = 12 – 3 =

– 8 = 13

– 8 =

15 – 7 =

11 – 7 =

12– 6 =

16 – 8 = 12 – 8 = 14 – 7 = 15 – 6 = – 6 = 15 – 8 = 11 – 8 = 13 – 7 = 14 – 6 = 14 – 5 = 14 – 8 = 16 – 7 = 12 – 7 = 13 – 6 = 13 – 5 = 11 – 3 = 11 – 2 = – 5 =

12 – 4=

13 – 4=

11 11

【练习题. 三】（20以内退位减法）

破十法口诀：看大数，分出10；减小数，加剩数。

15 － 6 = 12 － 5 = 17 － 9 =

13 － 4 = 11

16 － 8 = 15

12 － 7 = 14

12 － 9 = 11

16 － 9 = 15

11 － 6 = 13

13 － 9 = 17 － 5 = 14 － 9 = 18 － 9 = 13 － 3 = 12 － 8 = 13 － 4 = 14 － 8 = 14 － 7 = － 9 = － 7 = － 4 = － 8 = － 5 = － 6=

【练习题. 四】（凑十法）

1. 拆小数，凑大数

9 + 9 = 9 + 8 = 9 + 7 =

9 + 6 =

9 + 3 = 9 + 2 = 8 + 8 =

8 + 7 = 8 + 6 =

8 + 4 = 8 + 3 = 7 + 7 =

7 + 6 = 7 + 5 = 7 + 4 =

6 + 6 = 6 + 5 = 8 + 5 = 9 + 5 = 9 + 4 =

【练习题. 五】（凑十法）

2. 拆大数，凑小数 9 + 9 = 8 + 9 = 7 + 9 =

6 + 9 = 5 + 9 = 4 + 9 =

3 + 9 = 2 + 9 = 8 + 8 =

7 + 8 = 6 + 8 = 5 + 8 =

4 + 8 = 3 + 8 = 7 + 7 =

6 + 7 = 5 + 7 = 4 + 7 = 6 + 6 = 5 + 6 =

【练习题. 六】（凑十法）

5 + 6 =

6 + 6 =

6 + 8 =

7 + 7 =

7 + 4 = 6 + 5 = 5 + 7 = 7 + 6 = 5 + 9 = 9 + 7 = 6 + 9 = 7 + 5 = 5 + 8 = 8 + 5 = 9 + 5 =

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