Proportion and rates
Lesson 2 of 9
Direct proportion
Objective. Solve proportion problems using the unitary method.
The key idea
Find the value of one unit first, then scale up to the amount you need.
Worked example
6 pens cost £4.50. What do 10 cost?
- 1One pen costs 4.50 ÷ 6 = 0.75.
- 210 × 0.75 = 7.50.
Answer: £7.50
Practice
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