Mind MapMath · P5 / P6Ratio
Ratio One-Page Mind Map
Ratio compares quantities. The trick is knowing whether the question is asking about part-to-part, part-to-whole, or total units.
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1
What is Ratio?
A ratio compares two or more quantities using units. Order matters: 2 : 3 is NOT the same as 3 : 2.
2
Part-to-Part
Compares one group to another.
- ◆Boys : Girls = 2 : 3
- ◆For every 2 boys there are 3 girls
3
Part-to-Whole
Compares one group to the total.
- ◆Boys : Total = 2 : 5
- ◆2 out of every 5 people are boys
4
Total Units
Add all parts of the ratio to get total units. Then divide the total quantity by units to find 1 unit.
- ◆Ratio 2 : 3 → Total = 5 units
- ◆If total = 20, then 1 unit = 4
⚠️ Common Mistakes
Don't fall into these traps
- ✕Mixing up part-to-part with part-to-whole
- ✕Forgetting to simplify the final ratio
- ✕Not checking what each unit represents in the bar model
Teacher Hidayah's Tip
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Always circle the question first. If it says 'what fraction of the total', you need part-to-whole — not part-to-part.
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Sample Question
Try it, then read the worked solution
Question
The ratio of boys to girls in a class is 2 : 3. There are 20 students altogether. How many boys are there?
Worked Solution
- 1Total units = 2 + 3 = 5 units
- 25 units = 20 students → 1 unit = 4 students
- 3Boys = 2 units = 2 × 4 = 8 boys
Everything for Ratio
Each topic in the library comes with the full 5-piece bundle.
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Before-Class Prep
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After-Class Practice
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Downloadable Notes
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One-Page Mind Map
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Mistake Fix Zone