Factors Multiples and products of Primes

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Factors and HCF Home ANSWERS 1,2,4,5,10,20 1,2,3,4,6,8,12,24 1,3,9,27 1,2,4,8,16,32 1,2,4,5,8,10,20,40 1,2,5,10,25,50 1,2,4,6,7,8,14,28,56 1,2,3,4,5,6,10,12,20,24,30,40,60,120 1,2,4,5,10,20,40,50,100,200 2,3,5,7,11,13,17,19,23,29 (10 of them) 18 5 6 27 15 90 96 39 Find all the factors of the following numbers: 20 24 27 32 40 50 56 120 200 2 only has 2 factors (1 and 2), how many numbers can you find between 1 and 30 which have exactly 2 factors? (these are called prime numbers) Find the highest common factors of the following pairs of numbers: 18 and 54 25 and 45 12 and 18 27 and 108 30 and 75 Find the HCF of these pairs of numbers: 90 and 450 96 and 480 39 and 195 Home

Factor Trees Home Answers 22x5 3 x 23 3 x 24 2 x 32 x 5 34 2 x 52 Draw factor trees for the following numbers: 20 24 48 90 81 50 75 120 200 1800 2. Using your factor trees from question 1, write the numbers as products of their prime factors . Home

HCF and LCM Home Find the Highest Common Factor of these numbers: Find the Lowest Common Multiple of these numbers 6 and 7 4 and 6 5 and 8 10 and 4 16 and 5 14 and 21 2.2 and 5 0.4 and 7 6 5 8 12 10 14 13 19 42 12 40 20 80 55 14 Home