GCF HCF numbers and algebraic expressions

​Greatest_Highest Common Factors (GCF_HCF) of numbers and algebraic expressions

Multiple Select

Use a factor tree to prime factorise 36, write down your answer on your notebook, you will need it for the next two questions.

• 2×3×3×3

• 2×2×3×3

• 2×2×2×3

• 3×2×3×2

Multiple Choice

Use a factor tree to prime factorise 27, write down your answer on your notebook, you will need it for the next question.

• 2×3×3

• 3×3×3

• 2×2×3

• 2×2×2

Multiple Choice

Look at your notebook, what is the Greatest Common Factor (GCF) of 36 and 27?

• 9

• 3

• 6

• 4

Multiple Choice

Same idea, find the GCF of 56 and 72?

Show full working on your notebook

• 6

• 7

• 8

​Algebraic expressions are just letters replacing numbers, the rest works exactly the same way...

Multiple Choice

Find GCF of 6x² and 18x

• 6

• 6x²

• 6x

• 18

Multiple Choice

Find GCF of 24x²yz⁴ and 36xyz³

• xyz³

• 12

• 6xyz³

• 12xyz³