Everyday maths 1 (Wales)

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# 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?

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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