1桁の足し算と20までの引き算虫食い
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6 + 6 = 12 3 + 7 = 10
1 + 8 = 9 1 - 1 = 0
4 + 1 = 5 3 - 3 = 0
5 + 5 = 10 8 - 7 = 1
3 + 6 = 9 9 + 5 = 14
6 - 1 = 5 7 - 1 = 6
4 + 8 = 12 7 + 6 = 13
1 + 1 = 2 1 - 0 = 1
8 + 6 = 14 4 + 9 = 13
6 - 1 = 5 1 + 1 = 2
1 - 1 = 0 7 + 4 = 11
9 + 3 = 12 1 + 4 = 5
4 + 6 = 10 1 + 7 = 8
2 + 9 = 11 1 - 0 = 1
6 + 9 = 15 1 + 7 = 8
8 + 7 = 15 3 + 5 = 8
5 + 1 = 6 7 - 2 = 5
9 + 8 = 17 3 - 3 = 0
1 + 8 = 9 4 - 0 = 4
6 + 1 = 7 6 - 0 = 6
7 - 1 = 6 9 - 5 = 4
4 - 4 = 0 2 - 1 = 1
5 + 8 = 13 8 + 7 = 15
4 - 0 = 4 6 + 0 = 6
7 + 3 = 10 3 + 1 = 4
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