Objective

Be able to divide a quantity into a given ratio

Ratio: What does this mean?

A steel alloy rod is made up of 60% iron and 40% copper.

So the ratio of iron to copper is 60:40.

We could simplify this to give 3:2

Ratio is used to compare the sizes of two (or more) quantities. For example: a drink is made by mixing two parts orange juice with five parts water. This relationship of 2 to 5 can be written as the ratio 2:5.

Dividing a quantity in to a ratio

Divide 560kg in the ratio 3:4

Total parts1 part

partsparts

3 + 4 = 7560 ÷ 7 = 80

34

3 x 80 = 240kg4 x 80 = 320kg

Divide 560kg in the ratio 3:4 is 240kg:320kg

Time to try some!

1) £900 into the ratio 4:5

2) £200 into the ratio 3:5

3) £630 into the ratio 7:11

4) 2205kg into the ratio 8:13

5) 450 hours into the ratio 5:6:7

6) 550 lbs into the ratio 5:8:9

£400 : £500

£75 : £125

£245 : £385

840kg : 1365kg

125h : 150h : 175h

125lbs : 200lbs : 225lbs