← 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 234 · 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. 1.41² =
  2. 2.32² =
  3. 3.44² =
  4. 4.86² =
  5. 5.75² =
  6. 6.66² =
  7. 7.96² =
  8. 8.72² =
  9. 9.77² =
  10. 10.56² =
  11. 11.36² =
  12. 12.84² =
  13. 13.54² =
  14. 14.47² =
  15. 15.31² =
  16. 16.62² =
  17. 17.45² =
  18. 18.76² =
  19. 19.53² =
  20. 20.91² =
  21. 21.51² =
  22. 22.87² =
  23. 23.81² =
  24. 24.89² =
  25. 25.88² =
  26. 26.35² =
  27. 27.34² =
  28. 28.39² =
  29. 29.93² =
  30. 30.74² =
  31. 31.49² =
  32. 32.64² =
  33. 33.85² =
  34. 34.57² =
  35. 35.52² =
  36. 36.63² =
  37. 37.69² =
  38. 38.82² =
  39. 39.58² =
  40. 40.61² =

Answer key

  1. 1681
  2. 1024
  3. 1936
  4. 7396
  5. 5625
  6. 4356
  7. 9216
  8. 5184
  9. 5929
  10. 3136
  11. 1296
  12. 7056
  13. 2916
  14. 2209
  15. 961
  16. 3844
  17. 2025
  18. 5776
  19. 2809
  20. 8281
  21. 2601
  22. 7569
  23. 6561
  24. 7921
  25. 7744
  26. 1225
  27. 1156
  28. 1521
  29. 8649
  30. 5476
  31. 2401
  32. 4096
  33. 7225
  34. 3249
  35. 2704
  36. 3969
  37. 4761
  38. 6724
  39. 3364
  40. 3721

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