Sphere Week 3

Multiplication

WALT: work out the factors of a number

Factors

The factors of 8 are 1, 2, 4 and 8 because all of these numbers divide exactly into 8 with no remainders.

1. 72 = 9 x 8, 72 = 3 x 3 x 8, 72 = 3 x 3 x 4 x 2, 72 = 2 x 2 x 18

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Write these numbers as the product of some of their factors. Do this in as many ways as possible. The first one has been done for you.

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1. 24 (1 x 24, 2 x 12, 3 x 8, 4 x 6, 2 x 3 x 4)
2. 30
3. 48
4. 60
5. 96

Factors

2. 24 x 8 = 24 x 2 x 2 x 2

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Write each of these in a way that would be easier to multiply by using your knowledge of factors. The first one has been done for you.

• 69 x 8 = 69 x 2 x 2 x 2
• 36 x 16 =
• 16 x 6 =
• 33 x 9 =
• 15 x 12 =
• 20 x 56 =
• 60 x 24 =
• 80 x 53 =
• 60 x 22 =
• 24 x 80 =