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640 / 2 = 320

320 / 2 = 160

160 / 2 = 80

80 / 2 = 40

40 / 2 = 20

20 / 2 = 10

10 / 2 = 5

prime factorization is [2 2 2 2 2 2 2 5] or [2^7 * 5]

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Q: Write 640 as the product of prime numbers?
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