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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 327 · 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. 1.91² =
  2. 2.74² =
  3. 3.94² =
  4. 4.42² =
  5. 5.88² =
  6. 6.62² =
  7. 7.79² =
  8. 8.38² =
  9. 9.58² =
  10. 10.54² =
  11. 11.73² =
  12. 12.51² =
  13. 13.69² =
  14. 14.36² =
  15. 15.95² =
  16. 16.32² =
  17. 17.44² =
  18. 18.97² =
  19. 19.67² =
  20. 20.77² =
  21. 21.49² =
  22. 22.96² =
  23. 23.39² =
  24. 24.76² =
  25. 25.68² =
  26. 26.81² =
  27. 27.89² =
  28. 28.63² =
  29. 29.64² =
  30. 30.55² =
  31. 31.83² =
  32. 32.85² =
  33. 33.45² =
  34. 34.35² =
  35. 35.61² =
  36. 36.53² =
  37. 37.72² =
  38. 38.41² =
  39. 39.47² =
  40. 40.31² =

Answer key

  1. 8281
  2. 5476
  3. 8836
  4. 1764
  5. 7744
  6. 3844
  7. 6241
  8. 1444
  9. 3364
  10. 2916
  11. 5329
  12. 2601
  13. 4761
  14. 1296
  15. 9025
  16. 1024
  17. 1936
  18. 9409
  19. 4489
  20. 5929
  21. 2401
  22. 9216
  23. 1521
  24. 5776
  25. 4624
  26. 6561
  27. 7921
  28. 3969
  29. 4096
  30. 3025
  31. 6889
  32. 7225
  33. 2025
  34. 1225
  35. 3721
  36. 2809
  37. 5184
  38. 1681
  39. 2209
  40. 961

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