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672 is an even number, so it divides by 2. Do this.

672/2 = 336. Also even, so divide by two.

336/2 = 168. Also even, so divide by two.

168/2 = 84. divide by 2

84/2 = 42. divide by 2.

42/2 = 21. 21 is not even. Does it divide by 3 ? Bingo !!

count up the twos above - 5 of them.

So, 672 = 2x2x2x2x2x3x7.

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Q: How do you do the prime factorization of 672?
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