Greatest common factor of two or three numbers

Question 1

Find the GCF of 30, 18, 12.

Answer 

Question 2

98 = 2 × 7² and 140 = 2² × 5 × 7. Use these to find the GCF of 98 and 140.

Answer 

Question 3

Find the GCF (highest common factor) of 21 and 24.

Answer 

Question 4

Find the GCF of 40, 24, 16.

Answer 

Question 5

126 = 2 × 3² × 7 and 210 = 2 × 3 × 5 × 7. Use these to find the GCF of 126 and 210.

Answer 

Question 6

Find the GCF (highest common factor) of 30 and 42.

Answer 

Question 7

Find the GCF of 35, 49, 14.

Answer 

Question 8

98 = 2 × 7² and 140 = 2² × 5 × 7. Use these to find the GCF of 98 and 140.

Answer 

Question 9

Find the GCF (highest common factor) of 12 and 16.

Answer 

Question 10

Find the GCF of 10, 4, 14.

Answer 

Question 11

108 = 2² × 3³ and 180 = 2² × 3² × 5. Use these to find the GCF of 108 and 180.

Answer 

Question 12

Find the GCF (highest common factor) of 4 and 6.

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Question 13

Find the GCF of 12, 20, 8.

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Question 14

108 = 2² × 3³ and 180 = 2² × 3² × 5. Use these to find the GCF of 108 and 180.

Answer 

Question 15

Find the GCF (highest common factor) of 18 and 45.

Answer 

Question 16

Find the GCF of 15, 21, 9.

Answer