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

  1. 10 × 2 =
  2. 9 × 100 =
  3. 100 × 3 =
  4. 1 × 1000 =
  5. 6 × 100 =
  6. 10 × 7 =
  7. 100 × 10 =
  8. 2 × 10 =
  9. 5 × 10 =
  10. 1000 × 1 =
  11. 0 × 10 =
  12. 1000 × 9 =
  13. 4 × 1000 =
  14. 10 × 0 =
  15. 100 × 8 =
  16. 3 × 1000 =
  17. 10 × 5 =
  18. 7 × 1000 =
  19. 1000 × 6 =
  20. 8 × 10 =
  21. 100 × 4 =
  22. 1 × 100 =
  23. 1000 × 3 =
  24. 10 × 100 =

Answers to Exercise One

  1. 20
  2. 900
  3. 300
  4. 1000
  5. 600
  6. 70
  7. 1000
  8. 20
  9. 50
  10. 1000
  11. 0
  12. 9000
  13. 4000
  14. 0
  15. 800
  16. 3000
  17. 50
  18. 7000
  19. 6000
  20. 80
  21. 400
  22. 100
  23. 3000
  24. 1000

Exercise Two

Find the products. Check your work using the answer key at the end of the exercise.

  1. 100 × 9 =
  2. 10 × 1000 =
  3. 10 × 9 =
  4. 1000 × 8 =
  5. 6 × 10 =
  6. 100 × 0 =
  7. 3 × 100 =
  8. 10 × 1 =
  9. 100 × 1 =
  10. 5 × 1000 =
  11. 8 × 100 =
  12. 1000 × 4 =
  13. 9 × 10 =
  14. 10 × 100 =
  15. 10 × 6 =
  16. 5 × 100 =
  17. 1 × 10 =
  18. 9 × 1000 =
  19. 100 × 6 =
  20. 10 × 8 =
  21. 3 × 10 =
  22. 1000 × 0 =
  23. 2 × 1000 =
  24. 1000 × 7 =

Answers to Exercise Two

  1. 900
  2. 10000
  3. 90
  4. 8000
  5. 60
  6. 0
  7. 300
  8. 10
  9. 100
  10. 5000
  11. 800
  12. 4000
  13. 90
  14. 1000
  15. 60
  16. 500
  17. 10
  18. 9000
  19. 600
  20. 80
  21. 30
  22. 0
  23. 2000
  24. 7000

Topic B:  Self-Test

Mark    /18    Aim 15/18

  1. Find the products.  Be sure to check your answers. (6 marks)
    1. 3 × 10 =
    2. 6 × 100 =
    3. 8 × 1000 =
    4. 7 × 1000 =
    5. 4 × 100 =
    6. 5 × 10 =
  2. Find the products. Be sure to check your answers. (6 marks)
    1. 10 × 10 =
    2. 1000 × 9 =
    3. 100 × 10 =
    4. 100 × 2 =
    5. 10 × 0 =
    6. 1000 × 4 =
  3. Find the products.  Be sure to check your answers. (6 marks)
    1. 10 × 6 =
    2. 1000 × 7 =
    3. 100 × 4 =
    4. 5 × 1000 =
    5. 8 × 10 =
    6. 10 × 100 =

Answers to Topic B Self- Test

    1. 30
    2. 600
    3. 8000
    4. 7000
    5. 400
    6. 50
    1. 100
    2. 9000
    3. 1000
    4. 200
    5. 0
    6. 4000
    1. 60
    2. 7000
    3. 400
    4. 5000
    5. 80
    6. 1000

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Adult Literacy Fundamental Mathematics: Book 2 – 2nd Edition by Wendy Tagami and Liz Girard is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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