Everyday maths 1 (Wales)
Everyday maths 1 (Wales)

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Everyday maths 1 (Wales)

1.7 Multiplication

Multiplication by 10, 100 and 1 000

×10

To multiply a whole number by 10, we write the number then add one zero on the end. For example:

2 × 10 = 20 (2 × 1 = 2, then add a zero)

6 × 10 = 60

10 × 10 = 100

×100

When we multiply a whole number by 100, we add two zeros to the end of the number. For example:

3 × 100 = 300

25 × 100 = 2 500

60 × 100 = 6 000

×1 000

When we multiply a whole number by 1 000, we add three zeros to the end of the number. For example:

4 × 1 000 = 4 000

32 × 1 000 = 32 000

50 × 1 000 = 50 000

Now try the following activity.

Activity 8: Multiplying whole numbers by 10, 100 and 1 000

Now try the following:

  1. 7 × 10
  2. 32 × 10
  3. 120 × 10
  4. 8 × 100
  5. 21 × 100
  6. 520 × 100
  7. 3 × 1 000
  8. 12 × 1 000
  9. 45 × 1 000
  10. Pens cost 31 pence each. How much would it cost for a pack of ten pens?
  11. A supermarket buys boxes of cereal in batches of 100. If they buy 19 batches, how many boxes is this?
  12. Seven people win £1 000 each on the lottery. How much money is this altogether?

Answer

  1. 70
  2. 320
  3. 1 200
  4. 800
  5. 2 100
  6. 52 000
  7. 3 000
  8. 12 000
  9. 45 000
  10. 310 pence (or £3.10)
  11. 1 900 boxes of cereal
  12. £7 000
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