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Factors Multiples and products of Primes Factors Multiples and products of Primes

Factors Multiples and products of Primes - PowerPoint Presentation

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Uploaded On 2017-10-20

Factors Multiples and products of Primes - PPT Presentation

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

factors numbers factor find numbers factors find factor trees hcf common pairs highest answers prime products

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Presentation Transcript

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