number-bonds/addition-bonds/hard · 세트 9

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