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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 689 · 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. 1.93² =
  2. 2.91² =
  3. 3.36² =
  4. 4.37² =
  5. 5.41² =
  6. 6.98² =
  7. 7.85² =
  8. 8.56² =
  9. 9.31² =
  10. 10.35² =
  11. 11.49² =
  12. 12.75² =
  13. 13.44² =
  14. 14.52² =
  15. 15.63² =
  16. 16.57² =
  17. 17.67² =
  18. 18.71² =
  19. 19.76² =
  20. 20.86² =
  21. 21.61² =
  22. 22.99² =
  23. 23.33² =
  24. 24.54² =
  25. 25.88² =
  26. 26.58² =
  27. 27.79² =
  28. 28.95² =
  29. 29.65² =
  30. 30.55² =
  31. 31.96² =
  32. 32.42² =
  33. 33.59² =
  34. 34.47² =
  35. 35.77² =
  36. 36.72² =
  37. 37.73² =
  38. 38.39² =
  39. 39.45² =
  40. 40.94² =

Answer key

  1. 8649
  2. 8281
  3. 1296
  4. 1369
  5. 1681
  6. 9604
  7. 7225
  8. 3136
  9. 961
  10. 1225
  11. 2401
  12. 5625
  13. 1936
  14. 2704
  15. 3969
  16. 3249
  17. 4489
  18. 5041
  19. 5776
  20. 7396
  21. 3721
  22. 9801
  23. 1089
  24. 2916
  25. 7744
  26. 3364
  27. 6241
  28. 9025
  29. 4225
  30. 3025
  31. 9216
  32. 1764
  33. 3481
  34. 2209
  35. 5929
  36. 5184
  37. 5329
  38. 1521
  39. 2025
  40. 8836

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