Ratios
⭐ MasteredA ratio compares two amounts. If there are 2 apples and 3 oranges, the ratio of apples to oranges is 2 : 3.
Recipes use ratios to scale up or down.
All about Ratios
A ratio compares two or more amounts of the same kind. If there are 2 apples and 3 oranges, the ratio of apples to oranges is 2 : 3. The order matters, so the ratio of oranges to apples is 3 : 2.
Ratios can be simplified like fractions. The ratio 4 : 6 simplifies to 2 : 3 by dividing both sides by 2. Ratios are used to scale recipes up or down, and to compare groups fairly.
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Real-life uses of Ratios
- Mixing paint in the right colour strength
- Scaling a recipe for more or fewer people
- Describing the map scale that shows 1 cm for 10 km
Frequently asked questions about Ratios
How is a ratio different from a fraction?
A fraction compares a part to the whole. A ratio compares one part to another part, which may not add up to a whole.
How do you simplify the ratio 10 : 15?
Divide both numbers by 5 to get 2 : 3.
What is a unit rate?
A ratio with 1 in one part. If 3 pens cost £6, the unit rate is £2 per pen.