Page 249 - SK Year 5 Mathematics DLP

PROPORTION TO FIND A VALUE

1 I got the recipe for
a batik cake, mum.
• 600 g Marie biscuits
• 200 g butter
• 1 cup of cooking chocolate
• 1 cup of condensed milk
1
• cup of cocoa powder
2
1
• cup of boiled water
2
• 2 eggs
• Vanilla essence

a I want to make two batik cakes.
What is the mass of butter for
2 cups of cooking chocolate?

1 cup of cooking chocolate 200 g butter

2 cups of cooking chocolate 2 × 200 g = 400 g
The mass of butter for 2 cups of cooking chocolate
is 400 g.

b What is the mass of Marie biscuits needed when 300 g of butter
is used?
200 g butter for 600 g of Marie biscuits.

Divide by 2 to find the mass of Marie biscuits
for 100 g butter. Total up the mass of 200 g

100 g 300 g Marie biscuits and
200 g 600 g 100 g butter.
2 butter for 2 Marie biscuits.
1 1
300 g butter The mass of Marie

biscuits needed
200 g + 100 g 600 g + 300 g = 900 g

The mass of Marie biscuits needed when
300 g of butter is used is 900 g.

• Emphasise the use of arrows in proportional representations.
• Construct other appropriate questions from the recipe above to 241
7.3.1
enhance pupils’ understanding.