NumbersRatios

NumbersRatios are a way to divide up a whole quantity.If we had £200 to share out between 2 people it could be split evenly, £100 each. This would be a ratio of?

1:1

NumbersThe person giving the £200 may want to give more to one person than the other.

For every £4 Dave gets, Carol gets £6.This is a ratio of…..

To work out how much Dave and Carol are given the amount of money is divided by the total of the ratio.

4:6

Numbers4:6 is a total of 10 (4+6)

£200 is divided by 10= £20

Dave’s share (4) is multiplied by £20

Carol’s share (6) is multiplied by £204x£20 = £80

6x£20 = £120

NumbersDivide £640 in the ratio 3:5

• Step 1 Add the ratio numbers =

• Step 2 Divide the amount by the total ratio =

• Step 3 Multiply each ratio by the divided amount =

3+5 = 8

£640 ÷ 8= £80

3 x £80 = £240 5 x £80 = £400

NumbersWord Questions!!!

These are not hard, you just need to identify the ratio and the amount to be divided up.

A recipe for a cake requires 3 cups of flour, 2 cups of sugar and 1 cup of butter. How much flour will

be needed to make a 480g cake?Ratio =Total quantity = Quantity of Flour =

Flour 3: Sugar 2: Butter 1 3:2:1 = 6480 ÷ 6 = 80

3x80g = 240g

NumbersA driveway needs to be made from concrete in the ratio of 3 parts stone, 2 parts sand, 1 part cement. 24m3 of concrete is needed to make the driveway, how much of each is needed?