fact-family/add-sub-within-20-write-all · 세트 100

6 problems
1
Write the fact family for 3, 12, 15: =
2
Write the fact family for 10, 4, 14: =
3
Write the fact family for 18, 1, 19: =
4
Write the fact family for 15, 5, 20: =
5
Write the fact family for 8, 10, 18: =
6
Write the fact family for 16, 2, 18: =
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