Year 5 Ratio & Proportion
Simplify ratios, scale recipes, and share a total in a given ratio.
Try the worked examples below, then start an adaptive session that adjusts to your level.
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.
A recipe uses flour and sugar in a ratio of 5 : 2. If you use 250 g of flour, how much sugar do you need?
- 100 g
- 125 g
- 150 g
- 500 g
Answer: 100 g. One 'part' of flour = 250 ÷ 5 = 50 g. Sugar is 2 parts, so 2 × 50 = 100 g of sugar.
A class has boys : girls = 3 : 5. There are 24 children. How many girls?
- 15
- 9
- 12
- 20
Answer: 15. 8 parts = 24.
Skills in this topic
- Simplify RatioPractise simplify ratio within Ratio & Proportion for Year 5, with worked examples and instant feedback.
- Scale Ratio From One SidePractise scale ratio from one side within Ratio & Proportion for Year 5, with worked examples and instant feedback.
- Share In RatioPractise share in ratio within Ratio & Proportion for Year 5, with worked examples and instant feedback.
Frequently asked questions
- What is covered in Year 5 Ratio & Proportion?
- Simplify ratios, scale recipes, and share a total in a given ratio. Key skills include Simplify Ratio, Scale Ratio From One Side, Share In Ratio.
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