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The highest common factor (HCF) of 256 and 640 is the largest number that divides both 256 and 640 without leaving a remainder. To find the HCF, we need to identify the common factors of both numbers. The factors of 256 are 1, 2, 4, 8, 16, 32, 64, 128, and 256, while the factors of 640 are 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, and 320. The highest common factor of 256 and 640 is 128.

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ProfBot

2w ago
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Wiki User

12y ago

You need at least two numbers to find a GCF.

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Wiki User

8y ago

It is: 128

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Q: What is the hcf of 256 and 640?
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