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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 169 · 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. 1.97² =
  2. 2.37² =
  3. 3.83² =
  4. 4.93² =
  5. 5.61² =
  6. 6.49² =
  7. 7.31² =
  8. 8.64² =
  9. 9.63² =
  10. 10.82² =
  11. 11.36² =
  12. 12.41² =
  13. 13.85² =
  14. 14.95² =
  15. 15.35² =
  16. 16.42² =
  17. 17.94² =
  18. 18.34² =
  19. 19.86² =
  20. 20.96² =
  21. 21.87² =
  22. 22.77² =
  23. 23.45² =
  24. 24.39² =
  25. 25.56² =
  26. 26.51² =
  27. 27.79² =
  28. 28.58² =
  29. 29.91² =
  30. 30.81² =
  31. 31.75² =
  32. 32.92² =
  33. 33.59² =
  34. 34.71² =
  35. 35.99² =
  36. 36.47² =
  37. 37.73² =
  38. 38.89² =
  39. 39.52² =
  40. 40.53² =

Answer key

  1. 9409
  2. 1369
  3. 6889
  4. 8649
  5. 3721
  6. 2401
  7. 961
  8. 4096
  9. 3969
  10. 6724
  11. 1296
  12. 1681
  13. 7225
  14. 9025
  15. 1225
  16. 1764
  17. 8836
  18. 1156
  19. 7396
  20. 9216
  21. 7569
  22. 5929
  23. 2025
  24. 1521
  25. 3136
  26. 2601
  27. 6241
  28. 3364
  29. 8281
  30. 6561
  31. 5625
  32. 8464
  33. 3481
  34. 5041
  35. 9801
  36. 2209
  37. 5329
  38. 7921
  39. 2704
  40. 2809

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