1. Prime Factorisation – Index Form – 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. Prime Factorisation in Index Form
BINGO! 45 54 23 82 37 12 76 25 91
Prime Factorisation in Index Form

4. Choose your numbers… 22 x 7 24 x 3 23 x 11 22 x 5 22 x 52 22 x 3 x 7
Draw a 3x3 grid in your book.

5. Write 12 as a product of prime factors,
in index form. 12
2 x 2 x 3 = 12 2 6
22 x 3 = 12 2 3

6. Write 30 as a product of prime factors,
in index form. 30
2 x 3 x 5 = 30 2 15 3 5

7. Write 45 as a product of prime factors,
in index form. 45
3 x 3 x 5 = 45 3 15
32 x 5 = 45 3 5

8. Write 36 as a product of prime factors,
in index form. 36
2 x 2 x 3 x 3 = 36 2 18
22 x 32 = 36 2 9 3 3

9. Write 20 as a product of prime factors,
in index form. 20
2 x 2 x 5 = 20 2 10
22 x 5 = 20 2 5

10. Write 28 as a product of prime factors,
in index form. 28
2 x 2 x 7 = 28 2 14
22 x 7 = 28 2 7

11. Write 88 as a product of prime factors,
in index form. 88
2 x 2 x 2 x 11 = 88 2 44
23 x 11 = 88 2 22 2 11

12. Write 48 as a product of prime factors,
in index form. 48
2 x 2 x 2 x 2 x 3 = 48 2 24
24 x 3 = 48 2 12 2 6 2 3

13. Write 90 as a product of prime factors,
in index form. 90
2 x 3 x 3 x 5 = 90 2 45
2 x 32 x 5 = 90 3 15 3 5

14. Write 24 as a product of prime factors,
in index form. 24
2 x 2 x 2 x 3 = 24 2 12
23 x 3 = 24 2 6 2 3

15. Write 63 as a product of prime factors,
in index form. 63
3 x 3 x 7 = 63 3 21
32 x 7 = 63 3 7

16. Write 100 as a product of prime factors,
in index form.
100
2 x 2 x 5 x 5 = 100 2 50
22 x 52 = 100 2 25 5 5

17. Write 84 as a product of prime factors,
in index form. 84
2 x 2 x 3 x 7 = 84 2 42
22 x 3 x 7 = 84 2 21 3 7

18. Write 54 as a product of prime factors,
in index form. 54
2 x 3 x 3 x 3 = 54 2 27
2 x 33 = 54 3 9 3 3

19. Write 40 as a product of prime factors,
in index form. 40
2 x 2 x 2 x 5 = 40 2 20
23 x 5 = 40 2 10 2 5

20. Write 108 as a product of prime factors,
in index form.
108
2 x 2 x 3 x 3 x 3 = 108 2 54
22 x 33 = 108 2 27 3 9 3 3

22. tom@goteachmaths.co.uk Questions? Comments? Suggestions?
…or have you found a mistake!?
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