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