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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 530 · 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. 1.41² =
  2. 2.69² =
  3. 3.39² =
  4. 4.68² =
  5. 5.62² =
  6. 6.81² =
  7. 7.77² =
  8. 8.58² =
  9. 9.49² =
  10. 10.35² =
  11. 11.61² =
  12. 12.45² =
  13. 13.96² =
  14. 14.31² =
  15. 15.71² =
  16. 16.54² =
  17. 17.97² =
  18. 18.56² =
  19. 19.74² =
  20. 20.93² =
  21. 21.53² =
  22. 22.94² =
  23. 23.42² =
  24. 24.86² =
  25. 25.51² =
  26. 26.99² =
  27. 27.91² =
  28. 28.46² =
  29. 29.47² =
  30. 30.66² =
  31. 31.73² =
  32. 32.83² =
  33. 33.75² =
  34. 34.34² =
  35. 35.78² =
  36. 36.32² =
  37. 37.36² =
  38. 38.65² =
  39. 39.84² =
  40. 40.38² =

Answer key

  1. 1681
  2. 4761
  3. 1521
  4. 4624
  5. 3844
  6. 6561
  7. 5929
  8. 3364
  9. 2401
  10. 1225
  11. 3721
  12. 2025
  13. 9216
  14. 961
  15. 5041
  16. 2916
  17. 9409
  18. 3136
  19. 5476
  20. 8649
  21. 2809
  22. 8836
  23. 1764
  24. 7396
  25. 2601
  26. 9801
  27. 8281
  28. 2116
  29. 2209
  30. 4356
  31. 5329
  32. 6889
  33. 5625
  34. 1156
  35. 6084
  36. 1024
  37. 1296
  38. 4225
  39. 7056
  40. 1444

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