fact-family/add-sub-within-20/expert · セット 2

6 problems
1
Fact family for {7, 7, 14}: Write all 2 equations =
2
Fact family for {5, 10, 15}: Write all 4 equations =
3
Fact family for {3, 5, 8}: Write all 4 equations =
4
Fact family for {4, 7, 11}: Write all 4 equations =
5
Fact family for {3, 4, 7}: Write all 4 equations =
6
Fact family for {10, 10, 20}: Write all 2 equations =
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