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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 653 · 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. 1.41² =
  2. 2.85² =
  3. 3.47² =
  4. 4.43² =
  5. 5.52² =
  6. 6.63² =
  7. 7.42² =
  8. 8.62² =
  9. 9.56² =
  10. 10.58² =
  11. 11.69² =
  12. 12.32² =
  13. 13.46² =
  14. 14.33² =
  15. 15.77² =
  16. 16.81² =
  17. 17.66² =
  18. 18.71² =
  19. 19.91² =
  20. 20.83² =
  21. 21.38² =
  22. 22.87² =
  23. 23.37² =
  24. 24.57² =
  25. 25.45² =
  26. 26.73² =
  27. 27.59² =
  28. 28.44² =
  29. 29.88² =
  30. 30.31² =
  31. 31.64² =
  32. 32.84² =
  33. 33.34² =
  34. 34.74² =
  35. 35.48² =
  36. 36.49² =
  37. 37.51² =
  38. 38.54² =
  39. 39.39² =
  40. 40.86² =

Answer key

  1. 1681
  2. 7225
  3. 2209
  4. 1849
  5. 2704
  6. 3969
  7. 1764
  8. 3844
  9. 3136
  10. 3364
  11. 4761
  12. 1024
  13. 2116
  14. 1089
  15. 5929
  16. 6561
  17. 4356
  18. 5041
  19. 8281
  20. 6889
  21. 1444
  22. 7569
  23. 1369
  24. 3249
  25. 2025
  26. 5329
  27. 3481
  28. 1936
  29. 7744
  30. 961
  31. 4096
  32. 7056
  33. 1156
  34. 5476
  35. 2304
  36. 2401
  37. 2601
  38. 2916
  39. 1521
  40. 7396

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