number-bonds/to-50/medium · セット 1

8 problems
1
1 + ___ 8 =
2
1 + ___ 2 =
3
___ + 5 10 =
4
___ + 3 6 =
5
3 + ___ 7 =
6
1 + ___ 3 =
7
___ + 2 4 =
8
1 + ___ 9 =
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