You tube support For Playlist click here Factors and HCF Home 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 ID: 597858
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Slide1
Factors Multiples and products of PrimesSlide2
You tube support
For Playlist click
hereSlide3
Factors and HCF
Home
Find all the factors of the following numbers:
20
24
27
324050561202002 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 5425 and 4512 and 1827 and 10830 and 75Find the HCF of these pairs of numbers:90 and 45096 and 48039 and 195
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
39Slide4
Factor Trees
Home
Draw factor trees for the following numbers:
20
24
48
9081507512020018002. Using your factor trees from question 1, write the numbers as products of their prime factors .Answers 22x53 x 233 x 242 x 32
x 5
3
4
2 x 5
2
3 x 5
2
2
3
x 3 x 5
2
3
x 5
2
2
3
x 3
2
x 5
2Slide5
HCF and LCM
Home
Find the Highest Common Factor of these numbers:
18 and 30
15 and 20
16 and 24
12 and 3620 and 3028 and 7039 and 6538 and 57Find the Lowest Common Multiple of these numbers6 and 74 and 65 and 810 and 416 and 514 and 212.2 and 50.4 and 74212
40
20
80
42
55
14
6
5
8
12
10
14
13
19