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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 242 · 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. 1.49² =
  2. 2.92² =
  3. 3.65² =
  4. 4.43² =
  5. 5.32² =
  6. 6.63² =
  7. 7.96² =
  8. 8.69² =
  9. 9.85² =
  10. 10.59² =
  11. 11.57² =
  12. 12.56² =
  13. 13.71² =
  14. 14.61² =
  15. 15.34² =
  16. 16.97² =
  17. 17.33² =
  18. 18.94² =
  19. 19.75² =
  20. 20.36² =
  21. 21.55² =
  22. 22.51² =
  23. 23.46² =
  24. 24.67² =
  25. 25.54² =
  26. 26.77² =
  27. 27.95² =
  28. 28.41² =
  29. 29.35² =
  30. 30.83² =
  31. 31.44² =
  32. 32.81² =
  33. 33.31² =
  34. 34.78² =
  35. 35.86² =
  36. 36.62² =
  37. 37.87² =
  38. 38.68² =
  39. 39.45² =
  40. 40.64² =

Answer key

  1. 2401
  2. 8464
  3. 4225
  4. 1849
  5. 1024
  6. 3969
  7. 9216
  8. 4761
  9. 7225
  10. 3481
  11. 3249
  12. 3136
  13. 5041
  14. 3721
  15. 1156
  16. 9409
  17. 1089
  18. 8836
  19. 5625
  20. 1296
  21. 3025
  22. 2601
  23. 2116
  24. 4489
  25. 2916
  26. 5929
  27. 9025
  28. 1681
  29. 1225
  30. 6889
  31. 1936
  32. 6561
  33. 961
  34. 6084
  35. 7396
  36. 3844
  37. 7569
  38. 4624
  39. 2025
  40. 4096

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