fact-family/add-sub-within-20-write-all · Sada 89

4 problems
1
Write the fact family for 17, 1, 18: =
2
Write the fact family for 18, 2, 20: =
3
Write the fact family for 18, 1, 19: =
4
Write the fact family for 5, 4, 9: =
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