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Factor them.

2 x 5 = 10

2 x 3 x 3 = 18

Select the common factor.

The GCF is 2.

How to find the greatest common factor of any two numbers:

-- List all the factors of the first number. (Don't forget ' 1 ' and the number itself.)

-- List all the factors of the second number. (Don't forget ' 1 ' and the number itself.)

-- Make a new list: All factors that appear on both of the first two lists.

-- The largest number on the third list is the greatest common factor of the original two numbers.

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11y ago
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13y ago

The factors of 10 are: 1, 2, 5, 10

The factors of 18 are: 1, 2, 3, 6, 9, 18

The common factors are: 1, 2

The Greatest Common Factor (GCF) is: 2

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7y ago

Two or more numbers are needed to find the HCF

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11y ago

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Q: What are the common factors and greatest common factor of 10 and 18?
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