A ratio compares quantities and shows how much of one thing there is compared to another.
Ratio = 2:3 (2 red for every 3 blue)
8:12 = 2:3 (÷ 4)
15:25 = 3:5 (÷ 5)
Always divide by the highest common factor
Proportion tells us that two ratios are equal. Scale helps us make things bigger or smaller while keeping the same proportions.
If 3 apples cost £2, how much do 6 apples cost?
3 apples : £2 = 6 apples : £4
1. Simplify the ratio 12:18