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Q: What is the prime factorization of 145 using tree method?

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55 5,11

470 Divide by two. 235,2 Divide by five. 47,5,2 Stop. All the factors are prime.

It is: 2*2*2*2*2*2 = 64 or as 26 = 64

27 9,3 3,3,3

956 478,2 239,2,2

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31 is already prime; no method required.

139 is already prime; no factorization required.

40 20,2 10,2,2 5,2,2,2

55 5,11

The easiest way to notate the process of finding a prime factorization is a factor tree.

The prime factorization.

470 Divide by two. 235,2 Divide by five. 47,5,2 Stop. All the factors are prime.

It is: 2*2*2*2*2*2 = 64 or as 26 = 64

25 5,5

1997 is already prime; no tree.

3^2*5*2^3

2x2x222

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