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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 529 · 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. 1.99² =
  2. 2.57² =
  3. 3.49² =
  4. 4.56² =
  5. 5.33² =
  6. 6.98² =
  7. 7.41² =
  8. 8.47² =
  9. 9.64² =
  10. 10.59² =
  11. 11.44² =
  12. 12.51² =
  13. 13.74² =
  14. 14.92² =
  15. 15.83² =
  16. 16.54² =
  17. 17.65² =
  18. 18.53² =
  19. 19.45² =
  20. 20.91² =
  21. 21.93² =
  22. 22.96² =
  23. 23.46² =
  24. 24.55² =
  25. 25.38² =
  26. 26.63² =
  27. 27.34² =
  28. 28.42² =
  29. 29.86² =
  30. 30.71² =
  31. 31.94² =
  32. 32.78² =
  33. 33.88² =
  34. 34.62² =
  35. 35.73² =
  36. 36.82² =
  37. 37.77² =
  38. 38.72² =
  39. 39.81² =
  40. 40.79² =

Answer key

  1. 9801
  2. 3249
  3. 2401
  4. 3136
  5. 1089
  6. 9604
  7. 1681
  8. 2209
  9. 4096
  10. 3481
  11. 1936
  12. 2601
  13. 5476
  14. 8464
  15. 6889
  16. 2916
  17. 4225
  18. 2809
  19. 2025
  20. 8281
  21. 8649
  22. 9216
  23. 2116
  24. 3025
  25. 1444
  26. 3969
  27. 1156
  28. 1764
  29. 7396
  30. 5041
  31. 8836
  32. 6084
  33. 7744
  34. 3844
  35. 5329
  36. 6724
  37. 5929
  38. 5184
  39. 6561
  40. 6241

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