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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 381 · 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. 1.68² =
  2. 2.72² =
  3. 3.83² =
  4. 4.31² =
  5. 5.74² =
  6. 6.39² =
  7. 7.35² =
  8. 8.81² =
  9. 9.54² =
  10. 10.36² =
  11. 11.62² =
  12. 12.37² =
  13. 13.56² =
  14. 14.85² =
  15. 15.41² =
  16. 16.75² =
  17. 17.77² =
  18. 18.63² =
  19. 19.61² =
  20. 20.91² =
  21. 21.93² =
  22. 22.95² =
  23. 23.97² =
  24. 24.32² =
  25. 25.49² =
  26. 26.55² =
  27. 27.86² =
  28. 28.78² =
  29. 29.52² =
  30. 30.45² =
  31. 31.57² =
  32. 32.69² =
  33. 33.66² =
  34. 34.51² =
  35. 35.67² =
  36. 36.88² =
  37. 37.44² =
  38. 38.34² =
  39. 39.65² =
  40. 40.33² =

Answer key

  1. 4624
  2. 5184
  3. 6889
  4. 961
  5. 5476
  6. 1521
  7. 1225
  8. 6561
  9. 2916
  10. 1296
  11. 3844
  12. 1369
  13. 3136
  14. 7225
  15. 1681
  16. 5625
  17. 5929
  18. 3969
  19. 3721
  20. 8281
  21. 8649
  22. 9025
  23. 9409
  24. 1024
  25. 2401
  26. 3025
  27. 7396
  28. 6084
  29. 2704
  30. 2025
  31. 3249
  32. 4761
  33. 4356
  34. 2601
  35. 4489
  36. 7744
  37. 1936
  38. 1156
  39. 4225
  40. 1089

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