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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 473 · 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. 1.57² =
  2. 2.31² =
  3. 3.95² =
  4. 4.66² =
  5. 5.81² =
  6. 6.45² =
  7. 7.62² =
  8. 8.98² =
  9. 9.92² =
  10. 10.61² =
  11. 11.48² =
  12. 12.94² =
  13. 13.89² =
  14. 14.73² =
  15. 15.51² =
  16. 16.41² =
  17. 17.58² =
  18. 18.65² =
  19. 19.68² =
  20. 20.36² =
  21. 21.79² =
  22. 22.87² =
  23. 23.78² =
  24. 24.67² =
  25. 25.33² =
  26. 26.63² =
  27. 27.54² =
  28. 28.43² =
  29. 29.64² =
  30. 30.37² =
  31. 31.59² =
  32. 32.55² =
  33. 33.47² =
  34. 34.97² =
  35. 35.85² =
  36. 36.34² =
  37. 37.42² =
  38. 38.76² =
  39. 39.35² =
  40. 40.49² =

Answer key

  1. 3249
  2. 961
  3. 9025
  4. 4356
  5. 6561
  6. 2025
  7. 3844
  8. 9604
  9. 8464
  10. 3721
  11. 2304
  12. 8836
  13. 7921
  14. 5329
  15. 2601
  16. 1681
  17. 3364
  18. 4225
  19. 4624
  20. 1296
  21. 6241
  22. 7569
  23. 6084
  24. 4489
  25. 1089
  26. 3969
  27. 2916
  28. 1849
  29. 4096
  30. 1369
  31. 3481
  32. 3025
  33. 2209
  34. 9409
  35. 7225
  36. 1156
  37. 1764
  38. 5776
  39. 1225
  40. 2401

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