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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 83 · 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. 1.92² =
  2. 2.59² =
  3. 3.84² =
  4. 4.69² =
  5. 5.61² =
  6. 6.41² =
  7. 7.49² =
  8. 8.63² =
  9. 9.43² =
  10. 10.93² =
  11. 11.68² =
  12. 12.73² =
  13. 13.87² =
  14. 14.53² =
  15. 15.94² =
  16. 16.44² =
  17. 17.78² =
  18. 18.99² =
  19. 19.48² =
  20. 20.42² =
  21. 21.91² =
  22. 22.32² =
  23. 23.33² =
  24. 24.45² =
  25. 25.88² =
  26. 26.64² =
  27. 27.35² =
  28. 28.89² =
  29. 29.55² =
  30. 30.37² =
  31. 31.81² =
  32. 32.85² =
  33. 33.71² =
  34. 34.36² =
  35. 35.67² =
  36. 36.77² =
  37. 37.39² =
  38. 38.86² =
  39. 39.56² =
  40. 40.57² =

Answer key

  1. 8464
  2. 3481
  3. 7056
  4. 4761
  5. 3721
  6. 1681
  7. 2401
  8. 3969
  9. 1849
  10. 8649
  11. 4624
  12. 5329
  13. 7569
  14. 2809
  15. 8836
  16. 1936
  17. 6084
  18. 9801
  19. 2304
  20. 1764
  21. 8281
  22. 1024
  23. 1089
  24. 2025
  25. 7744
  26. 4096
  27. 1225
  28. 7921
  29. 3025
  30. 1369
  31. 6561
  32. 7225
  33. 5041
  34. 1296
  35. 4489
  36. 5929
  37. 1521
  38. 7396
  39. 3136
  40. 3249

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