Number Factors.

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Presentation transcript:

Number Factors

Factors are numbers that divide into a number exactly 6 4 1 Factors of 24 24 8 2 3 12

Usually we write factors in pairs Factors of 24 1 24 2 12 3 8 4 6

Write down all the factors of… 12 1 12 2 6 3 4

Write down all the factors of… 20 1 20 2 10 4 5

Write down all the factors of… 28 1 28 2 14 4 7

Write down all the factors of… 48 1 48 2 24 3 16 4 12

Independent Task Factor Spiders

Factor Spiders Solutions 1 1 9 5 54 30 6 54 6 30 2 2 18 10 27 15 3 3

Factor Spiders Solutions 10 1 1 9 90 9 63 15 90 63 2 6 7 3 30 45 3 21

1 1 4 6 12 18 12 18 3 3 2 2 6 9 Highest Common Factor (HCF) What is the Highest Common Factor (HCF) of 12 and 18? 1 1 4 6 12 18 12 18 3 3 2 2 6 9 The Highest Common Factor (HCF) of 12 and 18 is 6

1 1 7 28 21 28 7 21 4 3 2 14 Highest Common Factor (HCF) What is the Highest Common Factor (HCF) of 21 and 28? 1 1 7 28 21 28 7 21 4 3 2 14 The Highest Common Factor (HCF) of 21 and 28 is 7

Student Task Highest Common Factor

Find the HCF of the following pairs Independent Task - HCF Find the HCF of the following pairs 36 60 60 144

The Highest Common Factor (HCF) of 36 and 60 is 12 HCF - Solutions 6 10 6 12 1 1 9 36 5 60 60 36 4 15 2 2 4 12 30 18 3 20 3 The Highest Common Factor (HCF) of 36 and 60 is 12

The Highest Common Factor (HCF) of 144 and 60 is 12 HCF - Solutions 12 16 9 6 1 10 12 1 18 144 5 60 144 8 60 2 15 2 24 72 4 30 6 3 20 3 48 36 4 The Highest Common Factor (HCF) of 144 and 60 is 12