fact-family/add-sub-within-20/easy · 세트 3

6 problems
1
Fact family for {8, 4, 12}: Write all 4 equations =
2
Fact family for {1, 9, 10}: Write all 4 equations =
3
Fact family for {6, 8, 14}: Write all 4 equations =
4
Fact family for {9, 4, 13}: Write all 4 equations =
5
Fact family for {7, 6, 13}: Write all 4 equations =
6
Fact family for {6, 7, 13}: Write all 4 equations =
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