1. A new armchair costs £781. Christine has saved £308
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. _______________________
£308
£781
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.

4. _______________________+2
_______________________
£308
£310
£781
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

5. _______________________+2
+90
_______________________
£308
£310
£400
£781
A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair?
…..and again

6. _______________________+2
+90
+300
_______________________
£308
£310
£400
£700
£781
A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair?
…..keep going…..

7. _______________________+2
+90
+300
+80
_______________________
£308
£310
£400
£700
£780
£781
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!…..

8. _______________________+2
+90
+300
+80 +1
_______________________
£308
£310
£400
£700
£780
£781
A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair?
…..one more step…..!

9. _______________________+2
+90
+300
+80 +1
_______________________
£308
£310
£400
£700
£780
£781
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?

10. _______________________+2
+90
+300
+80 +1
_______________________
£308
£310
£400
£700
£780
£781
A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair? =
(Let’s make it easier though shall we?)

11. _______________________+2
+90
+300
+80 +1
_______________________
£308
£310
£400
£700
£780
£781
A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair? =
(Let’s make it easier though shall we?)

12. _______________________+2
+90
+300
+80 +1
_______________________
£308
£310
£400
£700
£780
£781
A new armchair costs £781. Christine has saved £308. How much more does she need to save to buy the armchair?
= 473
(Let’s make it easier though shall we?)