Greatest common factor
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List all factors of each number using T-charts.
Circle the common factors (numbers that appear on both lists). Put a star by the largest number they both have which is the GCF -- Greatest Common Factor. |
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18
1 x 18 2 x 9 3 x 6 |
56
1 x 56 2 x 28 4 x 14 7 x 8 |
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The GCF of 18 and 56 is 2
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Check out this video
*remember to use a t chart first
to generate a list of all factor pairs
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Click to set custom HTML
