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1.
看谁都能算对。
11-8= | 17-9= | 16-7= | 3+8-9= | 13-5= |
13-9= | 18-9= | 12-5+8= | 12-7= | 12-8= |
17-8= | 13-8+6= | 16-9= | 12-3= | 12-9= |
4+9-7= | 11-7= | 16-8= | 14-9= | 7+7-8= |
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1.
快速算出答案
11-4= | 12-7= | 6+8= | 16-8= |
15-9= | 14-5= | 12-3= | 13-6= |
12-8= | 9+7= | 7+6= | 15-8= |
17-8= | 15-9= | 9+5= | 13-5= |
17-8-3= | 15-9+6= | 14-5+3= | 16-8+3= |
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2.
口算训练
12+7= | 15-8= | 20-10= | 5+9= | 11-2= |
20-4= | 8+8= | 19-10= | 7+9= | 14-3= |
18-4= | 12-6= | 9-2= | 13-8= | 15-7= |
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