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1. A new armchair costs £781.
Christine has saved £308. How
much more does she need to save
to buy the armchair?
2. _______________________
• 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 =
3. _______________________
• 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
4. _______________________
• 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
5. _______________________
• 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
6. _______________________
• 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
7. _______________________
• 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
8. _______________________
• 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
9. _______________________
• 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
10. _______________________
• 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
11. _______________________
• 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
12. _______________________
• 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