A new armchair costs £781. Christine has saved £308. How

much more does she need to save to buy the armchair?

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• A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair?

This is a subtraction sum!

£225 - £87 =

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• A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair?

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

£781£308

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• A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair?

Then, count on to the nearest ‘easy’ number

£781£308 £310

+2

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• A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair?

…..and again

£781£308 £310

+2 +90

£400

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• A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair?

…..keep going…..

£781£308 £310

+2 +90

£400

+300

£700

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• A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair?

…..you’re not finished yet!…..

£781£308 £310

+2 +90

£400

+300

£700

+80

£780

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• A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair?

…..one more step…..!

£781£308 £310

+2 +90

£400

+300

£700

+80

£780

+1

_______________________

• A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair?

…..Excellent !

….but are we finished yet?

£781£308 £310

+2 +90

£400

+300

£700

+80

£780

+1

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• A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair?

2+90+300+80+1 =

(Let’s make it easier though shall we?)

£781£308 £310

+2 +90

£400

+300

£700

+80

£780

+1

_______________________

• A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair?

300+90+80+2+1=

(Let’s make it easier though shall we?)

£781£308 £310

+2 +90

£400

+300

£700

+80

£780

+1

_______________________

• A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair?

300+90+80+2+1= 473(Let’s make it easier though shall we?)

£781£308 £310

+2 +90

£400

+300

£700

+80

£780

+1