Find thecommon factors of:
(a) 20 and28 (b) 15 and 25
(c) 35 and50 (d) 56 and 120

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Solution

(a) Factorsof 20 = 1, 2, 4, 5, 10, 20
Factors of 28 = 1, 2, 4, 7, 14, 28
Common factors = 1, 2, 4
(b) Factorsof 15 = 1, 3, 5, 15
Factors of 25 = 1, 5, 25
Common factors = 1, 5
(c) Factorsof 35 = 1, 5, 7, 35
Factors of 50 = 1, 2, 5, 10, 25, 50
Common factors = 1, 5
(d) Factorsof 56 = 1, 2, 4, 7, 8, 14, 28, 56
Factors of 120 = 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60,120
Common factors = 1, 2, 4, 8

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Similar questions

Find the common factors of:

(a) 20 and 28 (b) 15 and 25

Question 1 (d)

Find the common factors of:
56 and 120

∠ A Q R = 35^{\circ}

∠ P A Q = 120^{\circ}

∠ S P R

A = {10, 15, 20, 25, 30, 35, 40, 45, 50}

B = {1, 5, 10, 15, 20, 30}

C = {7, 8, 15, 20, 35, 45, 48}

A - (B \cap C)

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