← Square any 2-digit number: up and down lesson New set →

Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 29 · 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. 1.91² =
  2. 2.87² =
  3. 3.83² =
  4. 4.43² =
  5. 5.41² =
  6. 6.45² =
  7. 7.37² =
  8. 8.85² =
  9. 9.51² =
  10. 10.69² =
  11. 11.33² =
  12. 12.47² =
  13. 13.44² =
  14. 14.86² =
  15. 15.38² =
  16. 16.95² =
  17. 17.56² =
  18. 18.63² =
  19. 19.62² =
  20. 20.34² =
  21. 21.81² =
  22. 22.92² =
  23. 23.67² =
  24. 24.54² =
  25. 25.77² =
  26. 26.31² =
  27. 27.42² =
  28. 28.48² =
  29. 29.53² =
  30. 30.36² =
  31. 31.61² =
  32. 32.58² =
  33. 33.76² =
  34. 34.73² =
  35. 35.88² =
  36. 36.57² =
  37. 37.64² =
  38. 38.72² =
  39. 39.46² =
  40. 40.89² =

Answer key

  1. 8281
  2. 7569
  3. 6889
  4. 1849
  5. 1681
  6. 2025
  7. 1369
  8. 7225
  9. 2601
  10. 4761
  11. 1089
  12. 2209
  13. 1936
  14. 7396
  15. 1444
  16. 9025
  17. 3136
  18. 3969
  19. 3844
  20. 1156
  21. 6561
  22. 8464
  23. 4489
  24. 2916
  25. 5929
  26. 961
  27. 1764
  28. 2304
  29. 2809
  30. 1296
  31. 3721
  32. 3364
  33. 5776
  34. 5329
  35. 7744
  36. 3249
  37. 4096
  38. 5184
  39. 2116
  40. 7921

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths