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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 557 · 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. 1.39² =
  2. 2.52² =
  3. 3.89² =
  4. 4.36² =
  5. 5.63² =
  6. 6.77² =
  7. 7.68² =
  8. 8.72² =
  9. 9.33² =
  10. 10.34² =
  11. 11.64² =
  12. 12.35² =
  13. 13.32² =
  14. 14.81² =
  15. 15.76² =
  16. 16.56² =
  17. 17.44² =
  18. 18.95² =
  19. 19.41² =
  20. 20.55² =
  21. 21.87² =
  22. 22.61² =
  23. 23.43² =
  24. 24.49² =
  25. 25.31² =
  26. 26.71² =
  27. 27.83² =
  28. 28.99² =
  29. 29.75² =
  30. 30.93² =
  31. 31.62² =
  32. 32.69² =
  33. 33.88² =
  34. 34.65² =
  35. 35.82² =
  36. 36.42² =
  37. 37.45² =
  38. 38.97² =
  39. 39.66² =
  40. 40.94² =

Answer key

  1. 1521
  2. 2704
  3. 7921
  4. 1296
  5. 3969
  6. 5929
  7. 4624
  8. 5184
  9. 1089
  10. 1156
  11. 4096
  12. 1225
  13. 1024
  14. 6561
  15. 5776
  16. 3136
  17. 1936
  18. 9025
  19. 1681
  20. 3025
  21. 7569
  22. 3721
  23. 1849
  24. 2401
  25. 961
  26. 5041
  27. 6889
  28. 9801
  29. 5625
  30. 8649
  31. 3844
  32. 4761
  33. 7744
  34. 4225
  35. 6724
  36. 1764
  37. 2025
  38. 9409
  39. 4356
  40. 8836

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