fact-family/add-sub-within-20-write-all · 套题 31
4 problems
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1
Write the fact family for 17, 2, 19:
=
2
Write the fact family for 19, 1, 20:
=
3
Write the fact family for 10, 1, 11:
=
4
Write the fact family for 16, 2, 18:
=