For 70 it is: 2, 5 and 7
For 90 it is: 2, 3, 3 and 5
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The Prime Factorization for 70 is 7 x 5 x 2
56
Reason 2 X 5 X 9 is Not Prime Factorization of 90The reason 2 X 5 X 9 is not the prime factorization of 90 is that 9 is not a prime number. 3 X 3 is 9, so the prime factorization of 90 is 2 X 3 X 3 X 5.
2 x 3 x 3 x 5 = 90
10, 20, 30, 40, 50, 60, 70, 80, 90