HCF LCM Prime Factorisation Shootout Students compete 1

HCF & LCM – Prime Factorisation – Shootout! Students compete (1 v 1 in pairs or in teams, at their tables or at the front) to answer questions the quickest. Students could write on your whiteboard or their own. Delete too difficult/easy question slides beforehand. Click anywhere to start the music, then click ‘Go’ to show the question, then click again to show the answer. This game has sound!

Shootout! HCF & LCM

Correct Answer = 1 pt Fastest! = 1 pt

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Find the Prime Factorisation of 36. Write your answer in index notation. 22 × 32

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The Prime Factorisation of 42 is 2 × 3 × 7. Find the Prime Factorisation of 420. 22 × 3 × 5 × 7

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The prime factors of two numbers have been placed into a Venn Diagram. What are the two numbers? 3 2 2 12 & 100 5 5

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The prime factors of two numbers have been placed into a Venn Diagram. What are the two numbers? What is their HCF? 3 3 5 2 90 & 60 HCF = 30 2

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The prime factors of two numbers have been placed into a Venn Diagram. What are the two numbers? What is their LCM? 3 5 2 7 2 30 & 28 LCM = 420

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Using Prime Factorisation, find the Highest Common Factor (HCF) of 12 & 18 HCF = 6

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Using Prime Factorisation, find the Lowest Common Multiple (LCM) of 12 & 20 LCM = 60

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Using Prime Factorisation, find the HCF & LCM of 28 & 42 HCF = 14 LCM = 84

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Using Prime Factorisation, find the Highest Common Factor (HCF) of 24 & 40 HCF = 8

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Using Prime Factorisation, find the Highest Common Factor (HCF) of 90 & 60 HCF = 30

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Using Prime Factorisation, find the Lowest Common Multiple (LCM) of 45 & 60 LCM = 180

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Using Prime Factorisation, find the Lowest Common Multiple (LCM) of 72 & 90 LCM = 360

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Using Prime Factorisation, find the Lowest Common Multiple (LCM) of 225 & 180 LCM = 900

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Using Prime Factorisation, find the HCF & LCM of 150 & 60 HCF = 30 LCM = 300

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Using Prime Factorisation, find the Lowest Common Multiple (LCM) of 450 & 700 LCM = 6300

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Using Prime Factorisation, find the Highest Common Factor (HCF) of 350 & 630 HCF = 70

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Using Prime Factorisation, find the HCF & LCM of 100 & 120 & 90 HCF = 10 LCM = 1800

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