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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 23 · 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. 1.42² =
  2. 2.58² =
  3. 3.57² =
  4. 4.89² =
  5. 5.72² =
  6. 6.62² =
  7. 7.65² =
  8. 8.94² =
  9. 9.74² =
  10. 10.73² =
  11. 11.92² =
  12. 12.91² =
  13. 13.71² =
  14. 14.85² =
  15. 15.41² =
  16. 16.45² =
  17. 17.56² =
  18. 18.34² =
  19. 19.44² =
  20. 20.49² =
  21. 21.32² =
  22. 22.48² =
  23. 23.52² =
  24. 24.47² =
  25. 25.33² =
  26. 26.43² =
  27. 27.95² =
  28. 28.69² =
  29. 29.55² =
  30. 30.54² =
  31. 31.79² =
  32. 32.61² =
  33. 33.97² =
  34. 34.46² =
  35. 35.93² =
  36. 36.87² =
  37. 37.83² =
  38. 38.53² =
  39. 39.78² =
  40. 40.68² =

Answer key

  1. 1764
  2. 3364
  3. 3249
  4. 7921
  5. 5184
  6. 3844
  7. 4225
  8. 8836
  9. 5476
  10. 5329
  11. 8464
  12. 8281
  13. 5041
  14. 7225
  15. 1681
  16. 2025
  17. 3136
  18. 1156
  19. 1936
  20. 2401
  21. 1024
  22. 2304
  23. 2704
  24. 2209
  25. 1089
  26. 1849
  27. 9025
  28. 4761
  29. 3025
  30. 2916
  31. 6241
  32. 3721
  33. 9409
  34. 2116
  35. 8649
  36. 7569
  37. 6889
  38. 2809
  39. 6084
  40. 4624

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