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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 94 · 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. 1.56² =
  2. 2.73² =
  3. 3.62² =
  4. 4.89² =
  5. 5.57² =
  6. 6.93² =
  7. 7.36² =
  8. 8.35² =
  9. 9.43² =
  10. 10.44² =
  11. 11.92² =
  12. 12.65² =
  13. 13.76² =
  14. 14.71² =
  15. 15.64² =
  16. 16.42² =
  17. 17.45² =
  18. 18.51² =
  19. 19.54² =
  20. 20.67² =
  21. 21.47² =
  22. 22.33² =
  23. 23.46² =
  24. 24.98² =
  25. 25.79² =
  26. 26.68² =
  27. 27.53² =
  28. 28.77² =
  29. 29.91² =
  30. 30.41² =
  31. 31.99² =
  32. 32.49² =
  33. 33.39² =
  34. 34.87² =
  35. 35.81² =
  36. 36.83² =
  37. 37.85² =
  38. 38.52² =
  39. 39.84² =
  40. 40.75² =

Answer key

  1. 3136
  2. 5329
  3. 3844
  4. 7921
  5. 3249
  6. 8649
  7. 1296
  8. 1225
  9. 1849
  10. 1936
  11. 8464
  12. 4225
  13. 5776
  14. 5041
  15. 4096
  16. 1764
  17. 2025
  18. 2601
  19. 2916
  20. 4489
  21. 2209
  22. 1089
  23. 2116
  24. 9604
  25. 6241
  26. 4624
  27. 2809
  28. 5929
  29. 8281
  30. 1681
  31. 9801
  32. 2401
  33. 1521
  34. 7569
  35. 6561
  36. 6889
  37. 7225
  38. 2704
  39. 7056
  40. 5625

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