1. Percentage – Decrease – 10s – Bingo Method
Students should choose nine answers from the grid and place them
randomly into a 3x3 square in their book.
You may want to pause your display and choose questions
according to difficulty during the game.
Depending on time, students could win with
a line, an X, or a ‘full house’ (all).

2. Printing To print handouts from slides -
Select the slide from the left. Then click:
File > Print > ‘Print Current Slide’
To print multiple slides -
Click on a section title to highlight all those slides,
or press ‘Ctrl’ at the same time as selecting slides to
highlight more than one. Then click:
File > Print > ‘Print Selection’
To print double-sided handouts -
Highlight both slides before using ‘Print Selection’.
Choose ‘Print on Both Sides’ and ‘Flip on Short Edge’.

3. Decreasing by a Percentage
BINGO! 45 54 23 82 37 12 76 25 91
Decreasing by a Percentage

4. Choose your numbers…
240
360 30
250 80 32
180
350
480
100
560 90
120 60 64
300
Draw a 3x3 grid in your book.

5. $200 10% = $20 Total = $180 Sarah invested $200.
The money decreased by 10%
in one year.
How much did she get back?
$200
10% =
$20
Total =
$180

6. The money decreased by 20%
Mike invested $300.
The money decreased by 20%
in one year.
How much did he get back?
$300
20% =
$60
Total =
$240

7. $600 50% = $300 Total = $300 Sally invested $600.
The money decreased by 50%
in one year.
How much did she get back?
$600
50% =
$300
Total =
$300

8. $500 30% = $150 Total = $350 Alice invested $500.
The money decreased by 30%
in one year.
How much did she get back?
$500
30% =
$150
Total =
$350

9. The money decreased by 40%
John invested $200.
The money decreased by 40%
in one year.
How much did he get back?
$200
40% =
$80
Total =
$120

10. The money decreased by 60%
Ahmed invested $200.
The money decreased by 60%
in one year.
How much did he get back?
$200
60% =
$120
Total =
$80

11. $500 80% = $400 Total = $100 Vera invested $500.
The money decreased by 80%
in one year.
How much did she get back?
$500
80% =
$400
Total =
$100

12. $80 20% = $16 Total = $64 Anna invested $80.
The money decreased by 20%
in one year.
How much did she get back?
$80
20% =
$16
Total =
$64

13. The money decreased by 70%
Chris invested $200.
The money decreased by 70%
in one year.
How much did he get back?
$200
70% =
$140
Total =
$60

14. The money decreased by 40%
Paul invested $600.
The money decreased by 40%
in one year.
How much did he get back?
$800
40% =
$320
Total =
$480

15. The money decreased by 10%
Peter invested $400.
The money decreased by 10%
in one year.
How much did he get back?
$400
10% =
$40
Total =
$360

16. $500 50% = $250 Total = $250 Ash invested $500.
The money decreased by 50%
in one year.
How much did she get back?
$500
50% =
$250
Total =
$250

17. $300 70% = $210 Total = $90 Lucy invested $300.
The money decreased by 70%
in one year.
How much did she get back?
$300
70% =
$210
Total =
$90

18. The money decreased by 60%
Danny invested $80.
The money decreased by 60%
in one year.
How much did he get back?
$80
60% =
$48
Total =
$32

19. $800 30% = $240 Total = $560 Gina invested $800.
The money decreased by 30%
in one year.
How much did she get back?
$800
30% =
$240
Total =
$560

20. $300 90% = $270 Total = $30 Holly invested $300.
The money decreased by 90%
in one year.
How much did she get back?
$300
90% =
$270
Total =
$30

22. tom@goteachmaths.co.uk Questions? Comments? Suggestions?
…or have you found a mistake!?
Any feedback would be appreciated .
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