fact-family/add-sub-within-20/expert · 套题 51
6 problems
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1
Write the fact family for 6, 14, 20:
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2
Write the fact family for 5, 2, 10:
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3
Write the fact family for 12, 1, 13:
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4
Write the fact family for 5, 4, 9:
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5
Write the fact family for 4, 10, 40:
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6
Write the fact family for 15, 5, 20:
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