NumberKS3 / GCSE

Highest common factor by listing

Find the greatest factor shared by two numbers.

  • List the positive factors of both numbers.
  • Identify the factors in both lists.
  • Choose the highest common factor.

Example 1

Find the highest common factor.

Choose the greatest number in both factor lists.

Example 2

Find the highest common factor.

Choose the greatest number in both factor lists.

Remember
Choose the highest common factor.

Your turn

Question 1

Find the highest common factor.

Check answer

Choose the greatest number in both factor lists.

Question 2

Find the highest common factor.

Check answer

Choose the greatest number in both factor lists.

Question 3

Find the highest common factor.

Check answer

Choose the greatest number in both factor lists.

Question 4

Find the highest common factor.

Check answer

Choose the greatest number in both factor lists.

Question 5

Find the highest common factor.

Check answer

Choose the greatest number in both factor lists.

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