fact-family/add-sub-within-20/hard · 세트 6

6 problems
1
Fact family for {3, 5, 8}: Write all 4 equations =
2
Fact family for {6, 10, 16}: Write all 4 equations =
3
Fact family for {6, 3, 9}: Write all 4 equations =
4
Fact family for {6, 5, 11}: Write all 4 equations =
5
Fact family for {8, 2, 10}: Write all 4 equations =
6
Fact family for {1, 7, 8}: Write all 4 equations =
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