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The prime factorization of 210 is 2 x 3 x 5 x 7. Every other factor can be made from those numbers. Remember to include 1.

1,2,3,5,7

(2x3, 2x5, 2x7) 6,10,14

Divide 210 by those numbers and you will have the other half of each factor pair.

15,21,30,35,42,70,105,210

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Q: How can you use the prime factorization to find the other factor pair?
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