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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 541 · 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. 1.92² =
  2. 2.73² =
  3. 3.91² =
  4. 4.41² =
  5. 5.85² =
  6. 6.46² =
  7. 7.43² =
  8. 8.72² =
  9. 9.89² =
  10. 10.62² =
  11. 11.42² =
  12. 12.34² =
  13. 13.55² =
  14. 14.48² =
  15. 15.99² =
  16. 16.93² =
  17. 17.84² =
  18. 18.75² =
  19. 19.51² =
  20. 20.49² =
  21. 21.66² =
  22. 22.71² =
  23. 23.52² =
  24. 24.37² =
  25. 25.86² =
  26. 26.94² =
  27. 27.31² =
  28. 28.53² =
  29. 29.98² =
  30. 30.81² =
  31. 31.87² =
  32. 32.74² =
  33. 33.63² =
  34. 34.36² =
  35. 35.77² =
  36. 36.95² =
  37. 37.47² =
  38. 38.54² =
  39. 39.65² =
  40. 40.44² =

Answer key

  1. 8464
  2. 5329
  3. 8281
  4. 1681
  5. 7225
  6. 2116
  7. 1849
  8. 5184
  9. 7921
  10. 3844
  11. 1764
  12. 1156
  13. 3025
  14. 2304
  15. 9801
  16. 8649
  17. 7056
  18. 5625
  19. 2601
  20. 2401
  21. 4356
  22. 5041
  23. 2704
  24. 1369
  25. 7396
  26. 8836
  27. 961
  28. 2809
  29. 9604
  30. 6561
  31. 7569
  32. 5476
  33. 3969
  34. 1296
  35. 5929
  36. 9025
  37. 2209
  38. 2916
  39. 4225
  40. 1936

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