fact-family/add-sub-within-20/medium · Sada 5

6 problems
1
Fact family for {2, 3, 5}: Write all 4 equations =
2
Fact family for {2, 10, 12}: Write all 4 equations =
3
Fact family for {3, 7, 10}: Write all 4 equations =
4
Fact family for {4, 7, 11}: Write all 4 equations =
5
Fact family for {6, 4, 10}: Write all 4 equations =
6
Fact family for {9, 4, 13}: Write all 4 equations =
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