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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 449 · 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. 1.66² =
  2. 2.81² =
  3. 3.89² =
  4. 4.35² =
  5. 5.38² =
  6. 6.51² =
  7. 7.84² =
  8. 8.41² =
  9. 9.39² =
  10. 10.31² =
  11. 11.92² =
  12. 12.77² =
  13. 13.93² =
  14. 14.85² =
  15. 15.96² =
  16. 16.67² =
  17. 17.44² =
  18. 18.88² =
  19. 19.94² =
  20. 20.54² =
  21. 21.43² =
  22. 22.59² =
  23. 23.37² =
  24. 24.72² =
  25. 25.32² =
  26. 26.63² =
  27. 27.95² =
  28. 28.48² =
  29. 29.62² =
  30. 30.98² =
  31. 31.34² =
  32. 32.45² =
  33. 33.47² =
  34. 34.36² =
  35. 35.42² =
  36. 36.53² =
  37. 37.79² =
  38. 38.55² =
  39. 39.73² =
  40. 40.83² =

Answer key

  1. 4356
  2. 6561
  3. 7921
  4. 1225
  5. 1444
  6. 2601
  7. 7056
  8. 1681
  9. 1521
  10. 961
  11. 8464
  12. 5929
  13. 8649
  14. 7225
  15. 9216
  16. 4489
  17. 1936
  18. 7744
  19. 8836
  20. 2916
  21. 1849
  22. 3481
  23. 1369
  24. 5184
  25. 1024
  26. 3969
  27. 9025
  28. 2304
  29. 3844
  30. 9604
  31. 1156
  32. 2025
  33. 2209
  34. 1296
  35. 1764
  36. 2809
  37. 6241
  38. 3025
  39. 5329
  40. 6889

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