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The GCF is the largest number that is a common factor to two or more numbers. Step 1: Factor completely both numbers. Step 2: All of the factors that are common are multiplied together to obtain the GCF. 108: 2*2*3*3*3 256: 2*2*2*2*2*2*2*2 Common numbers in both: 2 & 2; so GCF is 2*2 = 4.

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15y ago
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11y ago

Since 8 is a factor of 256, it is automatically the GCF.

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Wiki User

9y ago

The GCF is 4.

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Q: What is the greatest common factor of 108 and 256?
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