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

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’.

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)

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

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

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

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)

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

tom@goteachmaths.co.uk Questions? Comments? Suggestions? …or have you found a mistake!? Any feedback would be appreciated . Please feel free to email: tom@goteachmaths.co.uk