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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 462 · 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. 2.32² =
  3. 3.71² =
  4. 4.86² =
  5. 5.92² =
  6. 6.61² =
  7. 7.65² =
  8. 8.78² =
  9. 9.44² =
  10. 10.76² =
  11. 11.73² =
  12. 12.53² =
  13. 13.85² =
  14. 14.58² =
  15. 15.75² =
  16. 16.82² =
  17. 17.49² =
  18. 18.84² =
  19. 19.57² =
  20. 20.97² =
  21. 21.77² =
  22. 22.41² =
  23. 23.63² =
  24. 24.98² =
  25. 25.55² =
  26. 26.54² =
  27. 27.62² =
  28. 28.36² =
  29. 29.91² =
  30. 30.34² =
  31. 31.81² =
  32. 32.42² =
  33. 33.66² =
  34. 34.33² =
  35. 35.37² =
  36. 36.99² =
  37. 37.45² =
  38. 38.95² =
  39. 39.56² =
  40. 40.83² =

Answer key

  1. 4624
  2. 1024
  3. 5041
  4. 7396
  5. 8464
  6. 3721
  7. 4225
  8. 6084
  9. 1936
  10. 5776
  11. 5329
  12. 2809
  13. 7225
  14. 3364
  15. 5625
  16. 6724
  17. 2401
  18. 7056
  19. 3249
  20. 9409
  21. 5929
  22. 1681
  23. 3969
  24. 9604
  25. 3025
  26. 2916
  27. 3844
  28. 1296
  29. 8281
  30. 1156
  31. 6561
  32. 1764
  33. 4356
  34. 1089
  35. 1369
  36. 9801
  37. 2025
  38. 9025
  39. 3136
  40. 6889

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