10-9=1
10-10=0
20以内退位减法
11-1=10 | 11-2=9 | 11-3=8 | 11-4=7 | 11-5=6 | 11-6=5 | 11-7=4 | 11-8=3 | 11-9=2 | 11-10=1 |
12-2=10 | 12-3=9 | 12-4=8 | 12-5=7 | 12-6=6 | 12-7=5 | 12-8=4 | 12-9=3 | 12-10=2 | |
13-3=10 | 13-4=9 | 13-5=8 | 13-6=7 | 13-7=6 | 13-8=5 | 13-9=4 | 13-10=3 | ||
14-4-10 | 14-5=9 | 14-6=8 | 14-7=7 | 14-8=6 相关阅读:
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