HCF & LCM – Prime Factorisation – Bingo Only Answers 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). 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’. 45 54 23 82 37 12 76 25 91 1800 6 45 15 18 216 1 180 25 30 12 4158 120 2100 8100 54 Draw a 3x3 grid in your book. A = 2 × 3 × 52 B=2× 2 3 Find the Highest Common Factor of A & B 2×3=6 A = 2 2 × 32 × 32 × 5 2 B= 2 2 ×3 Find the HCF of A & B 22 × 3 = 12 A = 2 2 × 32 × 5 B=2× 2 3 Find the Lowest Common Multiple of A & B 22 × 32 × 5 = 180 A = 22 × 3 B= 3 2 ×5 Find the LCM of A & B 23 × 3 × 5 = 120 A = 3 2 × 52 B= 2 2 × 2 3 ×5 Find the Highest Common Factor of A & B 32 × 5 = 45 A = 2 × 52 B= 3 3 ×7 Find the Highest Common Factor of A & B 1 A = 2 2 × 32 B=2× 2 3 C = 2 × 32 × 5 Find the Highest Common Factor of A & B & C 2 × 32 = 18 A = 2 × 3 × 52 × 7 B= 2 2 ×3×7 Find the LCM of A & B 22 × 3 × 52 × 7 = 2100 A = 53 × 73 × 13 B= 2 2 ×3× 2 5 Find the Highest Common Factor of A & B 52 = 25 A = 32 × 5 B= 2 2 ×3× 2 5 C = 3 × 52 × 7 Find the Highest Common Factor of A & B & C 3 × 5 = 15 A = 2 × 33 × 11 B=2× 2 3 ×7 Find the Lowest Common Multiple of A & B 2 × 33 × 7 × 11 = 4158 A = 2 2 × 33 B= 3 2 × 2 3 Find the LCM of A & B 23 × 33 = 216 A = 22 × 3 × 5 B= 3 2 × 2 3 C = 2 × 32 × 52 Find the LCM of A & B & C 23 × 32 × 52 = 1800 A = 2 × 3 × 52 × 72 B= 3 2 × 3 3 ×5 Find the HCF of A & B 2 × 3 × 5 = 30 A = 2 × 33 × 5 B= 3 2 × 4 3 × 3 5 C = 22 × 33 Find the Highest Common Factor of A & B & C 2 × 33 = 54 A = 3 2 × 52 B= 4 3 C = 22 × 3 Find the Lowest Common Multiple of A & B & C 22 × 34 × 52 = 8100 Questions? Comments? Suggestions? …or have you found a mistake!? Any feedback would be appreciated . Please feel free to email: tom@goteachmaths.co.uk