Question 1 (a)

Find the common factors of:
20 and 28

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Solution

A factor of a number is an exact divisor of that number.
Factors of 20 = 1, 2, 4, 5,10, 20
Factors of 28 = 1, 2, 4, 7, 14, 28
Thus, common factors of 20 and 28 = 1, 2, 4

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Question 1 (d)

Find the common factors of:
56 and 120

14 p q, 28 p^{2} q^{2}

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