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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 71 · 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. 2.72² =
  3. 3.69² =
  4. 4.36² =
  5. 5.42² =
  6. 6.81² =
  7. 7.93² =
  8. 8.79² =
  9. 9.48² =
  10. 10.43² =
  11. 11.47² =
  12. 12.88² =
  13. 13.59² =
  14. 14.97² =
  15. 15.89² =
  16. 16.45² =
  17. 17.61² =
  18. 18.35² =
  19. 19.46² =
  20. 20.34² =
  21. 21.66² =
  22. 22.73² =
  23. 23.31² =
  24. 24.44² =
  25. 25.37² =
  26. 26.65² =
  27. 27.92² =
  28. 28.75² =
  29. 29.91² =
  30. 30.96² =
  31. 31.98² =
  32. 32.58² =
  33. 33.94² =
  34. 34.57² =
  35. 35.32² =
  36. 36.99² =
  37. 37.77² =
  38. 38.54² =
  39. 39.49² =
  40. 40.62² =

Answer key

  1. 3136
  2. 5184
  3. 4761
  4. 1296
  5. 1764
  6. 6561
  7. 8649
  8. 6241
  9. 2304
  10. 1849
  11. 2209
  12. 7744
  13. 3481
  14. 9409
  15. 7921
  16. 2025
  17. 3721
  18. 1225
  19. 2116
  20. 1156
  21. 4356
  22. 5329
  23. 961
  24. 1936
  25. 1369
  26. 4225
  27. 8464
  28. 5625
  29. 8281
  30. 9216
  31. 9604
  32. 3364
  33. 8836
  34. 3249
  35. 1024
  36. 9801
  37. 5929
  38. 2916
  39. 2401
  40. 3844

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