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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 676 · 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. 1.41² =
  2. 2.32² =
  3. 3.49² =
  4. 4.65² =
  5. 5.87² =
  6. 6.61² =
  7. 7.38² =
  8. 8.83² =
  9. 9.89² =
  10. 10.35² =
  11. 11.97² =
  12. 12.94² =
  13. 13.77² =
  14. 14.86² =
  15. 15.68² =
  16. 16.79² =
  17. 17.36² =
  18. 18.46² =
  19. 19.64² =
  20. 20.34² =
  21. 21.33² =
  22. 22.92² =
  23. 23.51² =
  24. 24.73² =
  25. 25.88² =
  26. 26.58² =
  27. 27.93² =
  28. 28.42² =
  29. 29.84² =
  30. 30.43² =
  31. 31.56² =
  32. 32.48² =
  33. 33.63² =
  34. 34.57² =
  35. 35.55² =
  36. 36.81² =
  37. 37.76² =
  38. 38.96² =
  39. 39.74² =
  40. 40.45² =

Answer key

  1. 1681
  2. 1024
  3. 2401
  4. 4225
  5. 7569
  6. 3721
  7. 1444
  8. 6889
  9. 7921
  10. 1225
  11. 9409
  12. 8836
  13. 5929
  14. 7396
  15. 4624
  16. 6241
  17. 1296
  18. 2116
  19. 4096
  20. 1156
  21. 1089
  22. 8464
  23. 2601
  24. 5329
  25. 7744
  26. 3364
  27. 8649
  28. 1764
  29. 7056
  30. 1849
  31. 3136
  32. 2304
  33. 3969
  34. 3249
  35. 3025
  36. 6561
  37. 5776
  38. 9216
  39. 5476
  40. 2025

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