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Ratio

Ratios compare amounts of the same kind; rates compare different units. Read one part at a time and tap “I know this”. Then test yourself in the quiz.

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Ratio

A ratio compares two amounts of the same kind: 2 red to 3 blue = 2 : 3. The order matters.

  • Simplify like a fraction: 6 : 9 = 2 : 3.
  • Share R50 in the ratio 2 : 3: 2 + 3 = 5 parts; 1 part = R10 → R20 and R30.
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Rate

A rate compares two different units: 60 km per hour, R12 per kg.

Rule

Which is cheaper? 6 apples for R18 (R3 each) or 4 for R10 (R2,50 each)? The second.

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Remember this and test yourself

Remember this: your summary
  • Ratio 2 : 3 compares the same kind of things; order matters.
  • Simplify ratios like fractions.
  • Sharing in a ratio: add the parts, find one part.
  • Rate = per: km/h, R/kg.

Write these points in your book. Read them again the night before the test.

Memory trick

Ratio: same kind. Rate: per something else.

Flash cards · Tap to turn over

Important words

First say the answer yourself, then turn the card over.

Now the real quiz!

The quiz has many more questions on this topic. Every question shows straight away whether you are right and explains why.

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Practise it step by step: Extra Maths ClassAll Grade 4 Maths summaries
For parents
  • Let your child work the examples on paper and explain them to you.
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Follows CAPS for Grade 4 Mathematics. Always check your teacher’s notes and textbook too.

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