Simplify Ratio (Year 5)
Practise simplify ratio within Ratio & Proportion for Year 5, with worked examples and instant feedback.
The questions below are generated to match the National Curriculum for Year 5 and get harder as you progress from Rookie to Guru.
Worked examples
In a class there are 12 boys and 8 girls. Write the ratio of boys to girls in its simplest form.
- 12 : 8
- 3 : 2
- 2 : 3
- 6 : 4
Answer: 3 : 2. Divide both sides by the highest common factor of 12 and 8, which is 4. 12 ÷ 4 = 3, 8 ÷ 4 = 2, so the ratio is 3 : 2.
Which is faster: 30 miles in 2 hours, or 50 miles in 3 hours?
- 50 in 3 (≈16.7 mph) > 30 in 2 (15 mph).
- Same.
- 30 in 2.
- Cannot tell.
Answer: 50 in 3 (≈16.7 mph) > 30 in 2 (15 mph).. Unit rate comparison.
Tom doubled 3:5 to get 6:10 and said the ratio is now bigger. Spot the issue.
- Both ratios are equivalent — same relationship.
- Right.
- Bigger numbers.
- Different.
Answer: Both ratios are equivalent — same relationship.. Scaling preserves ratio.
Related skills
Frequently asked questions
- What is simplify ratio?
- Practise simplify ratio within Ratio & Proportion for Year 5, with worked examples and instant feedback.
- How can my child practise simplify ratio at home?
- Work through the examples below, then start a free adaptive session. Northstar adjusts the difficulty automatically and tracks mastery over time.
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