1桁の足し算と20までの引き算虫食い
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4 - 0 = 4 4 + 4 = 8
6 - 3 = 3 8 + 4 = 12
8 + 4 = 12 3 + 5 = 8
2 - 2 = 0 9 - 5 = 4
1 - 1 = 0 8 - 2 = 6
6 - 1 = 5 6 + 2 = 8
6 - 0 = 6 4 + 8 = 12
2 + 1 = 3 8 + 0 = 8
9 - 1 = 8 7 - 2 = 5
9 + 3 = 12 1 - 1 = 0
6 - 1 = 5 9 - 9 = 0
3 + 3 = 6 1 + 8 = 9
1 - 0 = 1 3 + 0 = 3
3 + 8 = 11 9 + 7 = 16
6 + 6 = 12 3 - 0 = 3
7 + 8 = 15 1 - 1 = 0
7 - 1 = 6 1 - 1 = 0
3 - 3 = 0 7 + 4 = 11
1 - 1 = 0 4 - 2 = 2
1 - 1 = 0 4 - 1 = 3
6 - 5 = 1 6 - 0 = 6
2 - 0 = 2 8 - 4 = 4
4 - 2 = 2 4 - 4 = 0
2 + 8 = 10 9 + 4 = 13
6 + 5 = 11 7 + 0 = 7
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