Unit 4: Multiplication
Topic B: Multiplying by 10, 100 and 1 000
When multiplying by 10, 100, 1000, 10000, etc., place as many zeros to the right of the number as there are zeros in the 10, 100, 1000, etc..
To multiply by 10 put one zero after the number. To multiply by 100 put two zeros after the number.
To multiply by 1000 put three zeros after the number.
Example: 4 × 100 =
100 has two zeroes. Put two zeroes after the number.
4 × 100 = 400
Exercise One
- 10 × 2 =
- 9 × 100 =
- 100 × 3 =
- 1 × 1000 =
- 6 × 100 =
- 10 × 7 =
- 100 × 10 =
- 2 × 10 =
- 5 × 10 =
- 1000 × 1 =
- 0 × 10 =
- 1000 × 9 =
- 4 × 1000 =
- 10 × 0 =
- 100 × 8 =
- 3 × 1000 =
- 10 × 5 =
- 7 × 1000 =
- 1000 × 6 =
- 8 × 10 =
- 100 × 4 =
- 1 × 100 =
- 1000 × 3 =
- 10 × 100 =
Answers to Exercise One
- 20
- 900
- 300
- 1000
- 600
- 70
- 1000
- 20
- 50
- 1000
- 0
- 9000
- 4000
- 0
- 800
- 3000
- 50
- 7000
- 6000
- 80
- 400
- 100
- 3000
- 1000
Exercise Two
Find the products. Check your work using the answer key at the end of the exercise.
- 100 × 9 =
- 10 × 1000 =
- 10 × 9 =
- 1000 × 8 =
- 6 × 10 =
- 100 × 0 =
- 3 × 100 =
- 10 × 1 =
- 100 × 1 =
- 5 × 1000 =
- 8 × 100 =
- 1000 × 4 =
- 9 × 10 =
- 10 × 100 =
- 10 × 6 =
- 5 × 100 =
- 1 × 10 =
- 9 × 1000 =
- 100 × 6 =
- 10 × 8 =
- 3 × 10 =
- 1000 × 0 =
- 2 × 1000 =
- 1000 × 7 =
Answers to Exercise Two
- 900
- 10000
- 90
- 8000
- 60
- 0
- 300
- 10
- 100
- 5000
- 800
- 4000
- 90
- 1000
- 60
- 500
- 10
- 9000
- 600
- 80
- 30
- 0
- 2000
- 7000
Topic B: Self-Test
Mark /18 Aim 15/18
- Find the products. Be sure to check your answers. (6 marks)
- 3 × 10 =
- 6 × 100 =
- 8 × 1000 =
- 7 × 1000 =
- 4 × 100 =
- 5 × 10 =
- Find the products. Be sure to check your answers. (6 marks)
- 10 × 10 =
- 1000 × 9 =
- 100 × 10 =
- 100 × 2 =
- 10 × 0 =
- 1000 × 4 =
- Find the products. Be sure to check your answers. (6 marks)
- 10 × 6 =
- 1000 × 7 =
- 100 × 4 =
- 5 × 1000 =
- 8 × 10 =
- 10 × 100 =
Answers to Topic B Self- Test
-
- 30
- 600
- 8000
- 7000
- 400
- 50
-
- 100
- 9000
- 1000
- 200
- 0
- 4000
-
- 60
- 7000
- 400
- 5000
- 80
- 1000