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5
Add the two parts.
Class 5 · English Medium · Cambridge · Mathematics
Ratio and proportion foundations
Explore ratio and proportion foundations with an example and your own answers.
About this lesson and its coverage
Original Kidemy foundation practice · Read the example, write your answers, then check. This starter is shared across class versions; it is not a complete board-specific lesson or course.
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Learn the idea
A ratio compares quantities in a stated order. For a simple proportional recipe, multiplying every part by the same amount keeps the mixture the same.
Worked example
Red:blue = 2:3 means 2 red beads for every 3 blue beads. Two copies use 4 red and 6 blue.
- Read the example and explain which rule or evidence it uses.
- Try each task yourself, then compare the answer and its reason.
Your written practice
Show your working on paper. Check your answer, then choose Next.
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12
Eight red beads are four copies of two; use four copies of three blue.
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300
Find fifty grams per person, then multiply by six.
Take it further
Apply the idea in a new situation and explain your method. Open writing needs a guardian or teacher to review it.
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18
Five equal ratio parts each contain nine counters; take two parts.
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126
One costs eighteen; seven cost 126.
Write in your own words. A guardian or teacher should review this response.
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Starting with 3 cups and 2 cups, adding one to each gives 4:3, not 3:2. Scale both amounts by the same factor instead.
A counterexample plus a proportional method supports the answer.
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Related visual multiplication, division and fractions →
Related Stage 5 maths companion · confirm programme placement →