Easy way to teach ratio (from Summer Institute)

Annie and Beth share £35 in the ratio 4 to 3.

A:B

4:3

Draw 7 boxes

5 5 5 5:5 5 5 .

Chuck money in each box to make sure its fair.

Then add the totals:

£25:£15

Need to lead towards the idea that you’re dividing eventually

Extension is reverse

Beci and Charmaine share sweets in the ratio 2 to 3. If Charmaine has 300 how many are there altogether?

B:C

2:3

.       100 100:100 100 100

2oo:300

So 500 in total.

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