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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 306 · 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. 2.91² =
  3. 3.72² =
  4. 4.81² =
  5. 5.65² =
  6. 6.69² =
  7. 7.47² =
  8. 8.34² =
  9. 9.71² =
  10. 10.89² =
  11. 11.93² =
  12. 12.62² =
  13. 13.55² =
  14. 14.51² =
  15. 15.31² =
  16. 16.56² =
  17. 17.64² =
  18. 18.85² =
  19. 19.73² =
  20. 20.59² =
  21. 21.98² =
  22. 22.67² =
  23. 23.76² =
  24. 24.52² =
  25. 25.44² =
  26. 26.53² =
  27. 27.45² =
  28. 28.37² =
  29. 29.83² =
  30. 30.33² =
  31. 31.54² =
  32. 32.97² =
  33. 33.63² =
  34. 34.41² =
  35. 35.75² =
  36. 36.86² =
  37. 37.36² =
  38. 38.42² =
  39. 39.87² =
  40. 40.43² =

Answer key

  1. 1521
  2. 8281
  3. 5184
  4. 6561
  5. 4225
  6. 4761
  7. 2209
  8. 1156
  9. 5041
  10. 7921
  11. 8649
  12. 3844
  13. 3025
  14. 2601
  15. 961
  16. 3136
  17. 4096
  18. 7225
  19. 5329
  20. 3481
  21. 9604
  22. 4489
  23. 5776
  24. 2704
  25. 1936
  26. 2809
  27. 2025
  28. 1369
  29. 6889
  30. 1089
  31. 2916
  32. 9409
  33. 3969
  34. 1681
  35. 5625
  36. 7396
  37. 1296
  38. 1764
  39. 7569
  40. 1849

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