Scale Ratio From One Side (Year 5)
Practise scale ratio from one side 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
RookieRead and interpret directly.
There are 3 red marbles for every 2 blue. Write the ratio red : blue.
- 3 : 2
- 2 : 3
- 5 : 1
- 3 : 5
Answer: 3 : 2. Order matters.
ProCompare and infer.
If the ratio of boys to girls is 2 : 3 and there are 10 boys, how many girls?
- 15
- 13
- 30
- 5
Answer: 15. Scale ×5.
GuruMulti-step reasoning.
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 scale ratio from one side?
- Practise scale ratio from one side within Ratio & Proportion for Year 5, with worked examples and instant feedback.
- How can my child practise scale ratio from one side 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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