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To find the highest common factor of two numbers, you must first split them into their prime factors. In this case, the numbers 28 and 32 can split as follows:

28 = 2x2x7

32 = 2x2x2x2x2

The next step is to identify all common prime factors. In this case, the common prime factors are two 2s. To find the HCF, you just multiply these together:

2x2=4

Thus the highest common factor of 28 and 32 is 4.

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12y ago
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8y ago

The GCF is 4a

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8y ago

The GCF of 20, 28, and 32 is 4.

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9y ago

The GCF is 4.

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7y ago

The GCF is 4a.

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7y ago

The GCF is 4.

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Q: What is the highest common factor of 28 32?
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