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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 416 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.52² =
  2. 2.36² =
  3. 3.57² =
  4. 4.91² =
  5. 5.62² =
  6. 6.47² =
  7. 7.75² =
  8. 8.78² =
  9. 9.45² =
  10. 10.68² =
  11. 11.48² =
  12. 12.43² =
  13. 13.66² =
  14. 14.34² =
  15. 15.86² =
  16. 16.42² =
  17. 17.51² =
  18. 18.99² =
  19. 19.65² =
  20. 20.82² =
  21. 21.85² =
  22. 22.81² =
  23. 23.49² =
  24. 24.73² =
  25. 25.94² =
  26. 26.44² =
  27. 27.33² =
  28. 28.41² =
  29. 29.67² =
  30. 30.53² =
  31. 31.92² =
  32. 32.32² =
  33. 33.31² =
  34. 34.93² =
  35. 35.58² =
  36. 36.54² =
  37. 37.35² =
  38. 38.95² =
  39. 39.72² =
  40. 40.83² =

Answer key

  1. 2704
  2. 1296
  3. 3249
  4. 8281
  5. 3844
  6. 2209
  7. 5625
  8. 6084
  9. 2025
  10. 4624
  11. 2304
  12. 1849
  13. 4356
  14. 1156
  15. 7396
  16. 1764
  17. 2601
  18. 9801
  19. 4225
  20. 6724
  21. 7225
  22. 6561
  23. 2401
  24. 5329
  25. 8836
  26. 1936
  27. 1089
  28. 1681
  29. 4489
  30. 2809
  31. 8464
  32. 1024
  33. 961
  34. 8649
  35. 3364
  36. 2916
  37. 1225
  38. 9025
  39. 5184
  40. 6889

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