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23 June, 13:21

What the prime factors of 200

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  1. 23 June, 16:49
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    Start with 2, noting that 2 divides into 200 evenly. What's the next integer that also divides into 200 evenly? Not 3. 4? Yes. 5? Yes. And so on.

    I get {2, 4, 5, 8, 10}. Of course 20 is a factor of 200, but not a prime factor.

    8 and 10 are not prime. 8 = 2^3 and 10 = 2 and 5. But these factors {2, 5} have already been identified as prime factors of 200.

    Thus, the prime factors of 200 are {2, 5}. Note that 200 = 2*100, or

    2*4*25, or

    2^3*5^2.
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