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Celeste International School

Grade 5 · Worksheet

Numbers and sequences

Special numbers

Name: ______________________________Date: ______________Score: ______ / 20
  1. 1.

    What is the ninth square number?

  2. 2.

    Calculate 5 squared (5²).

  3. 3.

    Calculate 10 squared (10²).

  4. 4.

    Calculate 7 squared (7²).

  5. 5.

    What does 6² mean?

    1. A6 x 6
    2. B6 x 2
    3. C6 + 6
    4. D6 x 3
  6. 6.

    What is 6²?

  7. 7.

    What is the fourth square number?

  8. 8.

    Which of these is a square number?

    1. A16
    2. B18
    3. C20
    4. D24
  9. 9.

    36 is a square number.

    True False
  10. 10.

    50 is a square number.

    True False
  11. 11.

    What is 8 squared (8²)?

  12. 12.

    Work out the eleventh square number (11²).

  13. 13.

    Work out the twelfth square number (12²).

  14. 14.

    Put these square numbers in order from smallest to largest.

    Write the order (smallest to largest) in the boxes:

    • ?49
    • ?4
    • ?81
    • ?16
  15. 15.

    Which two square numbers add up to 45?

    1. A9 + 36
    2. B16 + 25
    3. C4 + 36
    4. D25 + 25
  16. 16.

    1 and 4 are two consecutive square numbers. What is their sum?

  17. 17.

    4 and 9 are two consecutive square numbers. What is their sum?

  18. 18.

    The first three square numbers are 1, 4, 9. What is the next square number?

    1. A16
    2. B12
    3. C13
    4. D10
  19. 19.

    Add the first three odd numbers: 1 + 3 + 5. What square number do you get?

  20. 20.

    What is the sum of the first five odd numbers: 1 + 3 + 5 + 7 + 9?

Celeste International School

Answer key

Numbers and sequences — Special numbers

  1. 1.81
  2. 2.25
  3. 3.100
  4. 4.49
  5. 5.A. 6 x 6
  6. 6.36
  7. 7.16
  8. 8.A. 16
  9. 9.True
  10. 10.False
  11. 11.64
  12. 12.121
  13. 13.144
  14. 14.4, 16, 49, 81
  15. 15.A. 9 + 36
  16. 16.5
  17. 17.13
  18. 18.A. 16
  19. 19.9
  20. 20.25