1. Factors Multiples and products of Primes

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3. 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
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4. 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 .
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5. 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
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