1. Prime Factorisation – Worksheet A
Worksheets increase in difficulty and are in three sizes

2. Printing To print handouts from slides -
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3. ①
Prime Factorisation Grids
Each circle contains the prime factors of
the number in the triangle.
Can you complete each puzzle? A) 3 8 70 20 28
175 50
125 42
105 18 63 75 30 45 3
245 28
385 98 12
182 30
273
130 45
231
363
325 75
195
125 99
117 27 50 70 18
105 42 B)

4. ②
Prime Factorisation Grids
Prime Factorisation Grid
Each circle contains the prime factors of the number in the box.
Can you complete each puzzle?
Each circle contains the prime factors of the number in the box.
Can you complete the puzzle? A) C) 40 54 24 56 36 16 84 90 60
100
330
104
858
490
140
156 84
126
294 88
196 81
315
726
210 36 90
495
135 16
132 60
198
350
550
546
462 40
770 56
1078 B)
135 81
140
126 90 54 56 84
132 24 40 16
198 36
100 60

5. ①
Prime Factorisation Grids
Each circle contains the prime factors of
the number in the triangle.
Can you complete each puzzle? A) 3 8 70 2 20 28
175 50
125 42
105 7 18 63 75 30 45 5 3
245 2 28 7
385 98 12 5
182 30
273
130 45
231
363
325 75
195
125 99
117 27 13 50 70 18
105 42 11 B)
Answers

6. ②
Prime Factorisation Grids
Prime Factorisation Grid
Each circle contains the prime factors of the number in the box.
Can you complete each puzzle?
Each circle contains the prime factors of the number in the box.
Can you complete the puzzle? A) C) 40 54 24 56 36 16 84 90 60 5 3 2 7
100
330
104
858 5 2 3 13
490
140
156 84
126
294 88
196 81
315
726
210 36 90
495
135 16
132 60
198
350 7
550
546
462 40
770 56
1078 11 B)
135 81
140
126 90 54 56 84
132 24 40 16
198 36
100 60 3 5 2 7 11

7. ①
Prime Factorisation Grids ①
Prime Factorisation Grids
Each circle contains the prime factors of
the number in the triangle.
Can you complete each puzzle?
Each circle contains the prime factors of
the number in the triangle.
Can you complete each puzzle? A) 3 8 70 20 28
175 50
125 42
105 18 63 75 30 45 A) 3 8 70 20 28
175 50
125 42
105 18 63 75 30 45 3
245 28
385 98 12
182 30
273
130 45
231
363
325 75
195
125 99
117 27 50 70 18
105 42 3
245 28
385 98 12
182 30
273
130 45
231
363
325 75
195
125 99
117 27 50 70 18
105 42 B) B)

10. ②
Prime Factorisation Grids
Prime Factorisation Grid
Each circle contains the prime factors of the number in the box.
Can you complete each puzzle?
Each circle contains the prime factors of the number in the box.
Can you complete the puzzle? A) C) 40 54 24 56 36 16 84 90 60
100
330
104
858
490
140
156 84
126
294 88
196 81
315
726
210 36 90
495
135 16
132 60
198
350
550
546
462 40
770 56
1078 B)
135 81
140
126 90 54 56 84
132 24 40 16
198 36
100 60

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