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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


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A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?. Hello, I’m ‘Helpful Bear’ and I’m going to be helping you through this number problem. _______________________.

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Presentation Transcript
slide2

Hello, I’m ‘Helpful Bear’ and I’m going to be helping you through this number problem.

slide3
_______________________
  • 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 =

slide4

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

_______________________

£87

£225

  • A TV costs £225. Sally has saved £87. How much more does she need to save to buy the TV?
slide5

+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 up to the next ‘easy number’

slide6

+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……

slide7

+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?

…you’re doing well, keep going…..

slide8

+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?

….nearly there

slide9

+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?

…last one….!

slide10

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?
slide11

+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…….

slide12

+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 =

slide13

+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

slide14

+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?

So, to recap: To find the difference by counting on we first add units to the nearest ten.

slide15

+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?

Then, we count on in tens to the nearest hundred.

slide16

+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?

Then we count on in hundreds to the nearest hundred below our target number.

slide17

+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?

We count again in tens to the nearest ten below our target number.

slide18

+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?

…and finally, we count on in units to our target number.

slide19

+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?

Now we total up the amounts we have counted on to give us the difference between the initial two numbers

slide20

WELL DONE!

You’ve worked and listened well.

Now see if you can try the next problem your teacher sets you (in your pairs)

Good Luck!