What are the common multiples of 3 and 7 up to 70?
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The common multiples of 3 and 7 up to 70 are 21, 42, and 63.
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3*7=21 So common multiplies of 3 and 7 would be any multiply of 21: 0*21=0 1*21=21 2*21=42 3*21=63 4*21=84 and this is over 70.
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