1桁の足し算と20までの引き算虫食い
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4 - 4 = 0 3 + 1 = 4
6 + 2 = 8 4 + 8 = 12
2 + 7 = 9 9 - 8 = 1
8 - 8 = 0 6 + 9 = 15
5 - 3 = 2 8 - 3 = 5
2 + 0 = 2 4 + 3 = 7
9 - 9 = 0 5 + 6 = 11
9 - 0 = 9 2 + 7 = 9
4 - 2 = 2 4 - 1 = 3
1 + 3 = 4 1 - 1 = 0
8 + 6 = 14 6 - 5 = 1
2 - 1 = 1 7 + 6 = 13
5 + 3 = 8 3 - 0 = 3
5 - 1 = 4 6 - 2 = 4
2 - 0 = 2 6 - 0 = 6
1 + 9 = 10 2 - 1 = 1
9 + 6 = 15 5 - 3 = 2
4 - 4 = 0 2 - 1 = 1
1 - 1 = 0 7 - 5 = 2
1 + 3 = 4 4 - 2 = 2
4 - 1 = 3 3 - 0 = 3
9 + 9 = 18 9 - 2 = 7
9 - 4 = 5 2 - 0 = 2
2 - 1 = 1 1 + 1 = 2
9 - 4 = 5 9 + 7 = 16
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