fact-family/add-sub-within-20/expert · 套题 46
6 problems
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1
Write the fact family for 8, 6, 48:
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2
Write the fact family for 4, 7, 28:
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3
Write the fact family for 10, 2, 20:
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4
Write the fact family for 1, 4, 5:
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5
Write the fact family for 11, 12, 132:
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6
Write the fact family for 4, 13, 17:
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