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Q: How would you explain that 7 is a factor of140?

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I can't explain it. 7 is not a factor of 291.

It is: 2*2*5*7 = 140

22 x 5 x 7

You know that 7 isn't a factor of 291 because the quotient of 291 and 7 isn't a whole number.

Yes, because 7 divides evenly into 42 with no remainder.

No. Only 14 and multiples of 14 have both 7 and 2 as factors.

Divide your number by 7 and see if there is a remainder. If there is a remainder, 7 is not a factor.

A factor rainbow for 7 would have only one arc, with the numbers 1 and 7.

Divide 7 into 291. If the answer is an integer, 7 is a factor.

Divide 7 into 291. If the answer is an integer, it's a factor.

There isn't an easy test for 7. You have to divide it. 7 is not a factor of 291.

it would be 7

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