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Since 100 is an even number, it must be divisible by 2; 100/2 = 50. The same applies to 50; 50/2 = 25. 25 ends with the number 5, and so therefore must be divisible by the number 5; 25/5 = 5. Our factors are now 2 X 2 X 5 X 5, which are all prime numbers. Therefore, the prime factorization of 100 is 22 X 52.
The prime factorization of 100 is:

5 * 5 * 2 * 2 * 1

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Q: How do you write 100 as a product of prime numbers?
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