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Using Proportion to Adapt Recipes

In this worksheet, students must use proportion to adapt recipes.

'Using Proportion to Adapt Recipes' worksheet

Key stage:  KS 2

Curriculum topic:   Ratio and Proportion

Curriculum subtopic:   Solve Ratio Problems

Difficulty level:  

Worksheet Overview

This worksheet is about proportion.

Here is a recipe for 12 flapjacks.

  • 8 oz butter
  • 6 oz sugar
  • 6 oz porridge oats

Flapjacks

 

To find the quantities needed for 8 flapjacks, we first find how much is needed for 1 flapjack.

 

For 1 flapjack, divide each quantity by 12.

 

You need   
8
12
 = 
2
3
 oz butter
 
6
12
 = 
1
2
 oz sugar and
1
2
 oz oats.

 

 

For 8 flapjacks, multiply each of these quantities by 8.

 

You need   
2
3
× 8  = 
16
3
   =  5
1
3
 oz butter
 
1
2
× 8  =  4 oz sugar and 4 oz oats.

 

 

Alternatively, work out 8 ÷ 12 = 2/3, so find 2/3 of each quantity.

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