凑十法和破十法练习
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（一）凑十法练习
5 + 8 = 5 + 7 = 5 +
6 =
9 + 4 = = 4 + 7 =
3 + 9 = 3 + 8 = 2 + 9 =
（二）破十法练习题
18 –9 = 17 –9 = 16 –9 = 15 –9 =
14 –9 = 13 –9 = 12 –9 = 11 –9 =
17 –8 = 16 –8 = 15- 8 = 14–8 =
13 –8 = 12 –8 = 11 –8 = 16 –7 = 15–7 = 14–7 = 13 –7 = 12 –7 = 11 -7 = 15 –6 = 14 - 6 = 13–6 = 12–6 = 11 –6 = 14–5 = 13–5 = 12–5 = 11–5 = 13-4= 12–4= 11-4= 12-3= 11-3= 11-4=