fact-family/add-sub-within-20/medium · セット 37

6 problems
1
Write the fact family for 1, 3, 4: =
2
Write the fact family for 5, 9, 14: =
3
Write the fact family for 4, 13, 17: =
4
Write the fact family for 9, 9, 81: =
5
Write the fact family for 3, 8, 24: =
6
Write the fact family for 2, 4, 8: =
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