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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 90 · 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. 1.94² =
  2. 2.92² =
  3. 3.36² =
  4. 4.89² =
  5. 5.99² =
  6. 6.91² =
  7. 7.55² =
  8. 8.51² =
  9. 9.63² =
  10. 10.52² =
  11. 11.77² =
  12. 12.74² =
  13. 13.69² =
  14. 14.96² =
  15. 15.49² =
  16. 16.67² =
  17. 17.93² =
  18. 18.32² =
  19. 19.64² =
  20. 20.34² =
  21. 21.68² =
  22. 22.81² =
  23. 23.41² =
  24. 24.72² =
  25. 25.75² =
  26. 26.85² =
  27. 27.82² =
  28. 28.33² =
  29. 29.42² =
  30. 30.98² =
  31. 31.53² =
  32. 32.31² =
  33. 33.59² =
  34. 34.44² =
  35. 35.97² =
  36. 36.87² =
  37. 37.43² =
  38. 38.35² =
  39. 39.45² =
  40. 40.39² =

Answer key

  1. 8836
  2. 8464
  3. 1296
  4. 7921
  5. 9801
  6. 8281
  7. 3025
  8. 2601
  9. 3969
  10. 2704
  11. 5929
  12. 5476
  13. 4761
  14. 9216
  15. 2401
  16. 4489
  17. 8649
  18. 1024
  19. 4096
  20. 1156
  21. 4624
  22. 6561
  23. 1681
  24. 5184
  25. 5625
  26. 7225
  27. 6724
  28. 1089
  29. 1764
  30. 9604
  31. 2809
  32. 961
  33. 3481
  34. 1936
  35. 9409
  36. 7569
  37. 1849
  38. 1225
  39. 2025
  40. 1521

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