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A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?

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A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV? - PowerPoint PPT Presentation

A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?. _______________________. A TV costs £225 . Sally has saved £87. How much more does she need to save to buy the TV?. This is a subtraction sum! £225 - £87 = . _______________________. £87. £225.

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A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?

_______________________
• A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?

This is a subtraction sum!

£225 - £87 =

_______________________

£87

£225

• A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?

Firstly, put the numbers you are going to use on the number line.

+3

_______________________

£87

£90

£225

• A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?

Then, count on to the nearest ‘easy’ number

+3

+10

_______________________

£87

£90

£100

£225

• A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?

…..and again

+3

+10

+100

_______________________

£87

£90

£100

£200

£225

• A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?

…..keep going…..

+3

+10

+100

+20

_______________________

£87

£90

£100

£200

£220

£225

• A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?

…..you’re not finished yet!…..

+3

+10

+100

+20

+5

_______________________

£87

£90

£100

£200

£220

£225

• A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?

…..one more step…..!

+3

+10

+100

+20

+5

_______________________

£87

£90

£100

£200

£220

£225

• A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?

EXCELLENT – but are we finished?

What else do we need to do?

+3

+10

+100

+20

+5

_______________________

£87

£90

£100

£200

£220

£225

• A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?

3+10+100+20+5=

(Tell you what….lets make it even easier…….

+3

+10

+100

+20

+5

_______________________

£87

£90

£100

£200

£220

£225

• A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?

100+20+10+5+3 =

+3

+10

+100

+20

+5

_______________________

£87

£90

£100

£200

£220

£225

• A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?

100+20+10+5+3 = 138