Question
Find the common factors of:
20 and 28
20 and 28
✓
Answer
20 and 28
20 = 1 × 20
20 = 2 × 10
20 = 4 × 5
i.e., the factors of 20 are 1, 2, 4, 5, 10 and 20.
Again, 28 = 1 × 28
28 = 2 × 14
28 = 7 × 4
i.e., the factors of 28 are 1, 2, 4, 7, 14 and 28.
Therefore, the common factors of the two numbers are 1, 2 and 4.
20 = 1 × 20
20 = 2 × 10
20 = 4 × 5
i.e., the factors of 20 are 1, 2, 4, 5, 10 and 20.
Again, 28 = 1 × 28
28 = 2 × 14
28 = 7 × 4
i.e., the factors of 28 are 1, 2, 4, 7, 14 and 28.
Therefore, the common factors of the two numbers are 1, 2 and 4.
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