Simplifying ratios (11 Essential Maths)

A ratio is fully simplified by ___ each part by the ___.

• multiplying

• dividing

• highest common factor

• lowest common factor

The highest common factor (HCF) is the ___ number that divides ___ into two or more numbers.

• exactly

• smallest

• largest

• closely

Our class has 10 boys and 10 girls; what is the unsimplified ratio of boys to girls?

• 10:20

• 10:10

• 20:10

5 x 8

• 32

• 35

• 40

• 42

7 x 4

• 24

• 28

• 32

• 35

 $36\ \div\ 9$  

• 4

• 5

• 6

• 7

 $24\ \div\ 4$  

• 4

• 5

• 6

• 7

Identify the highest common factor for these numbers:

65, 30, 10, 25, 5

• 3

• 5

• 10

If your ratio includes all even numbers, what do you immediately know could be your first step for simplifying?

• Divide by 2

• Multiply by 2

• Divide by 1

• You can't know if you don't know the numbers

Fully simplify this ratio

12 : 18

• 6 : 9

• 2 : 3

• 1 : 3

• 4 : 6