← 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 286 · 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. 1.71² =
  2. 2.98² =
  3. 3.62² =
  4. 4.31² =
  5. 5.88² =
  6. 6.32² =
  7. 7.46² =
  8. 8.53² =
  9. 9.37² =
  10. 10.34² =
  11. 11.41² =
  12. 12.96² =
  13. 13.58² =
  14. 14.47² =
  15. 15.84² =
  16. 16.95² =
  17. 17.38² =
  18. 18.54² =
  19. 19.49² =
  20. 20.33² =
  21. 21.85² =
  22. 22.67² =
  23. 23.69² =
  24. 24.61² =
  25. 25.79² =
  26. 26.73² =
  27. 27.92² =
  28. 28.63² =
  29. 29.76² =
  30. 30.44² =
  31. 31.64² =
  32. 32.99² =
  33. 33.55² =
  34. 34.35² =
  35. 35.59² =
  36. 36.97² =
  37. 37.87² =
  38. 38.77² =
  39. 39.36² =
  40. 40.57² =

Answer key

  1. 5041
  2. 9604
  3. 3844
  4. 961
  5. 7744
  6. 1024
  7. 2116
  8. 2809
  9. 1369
  10. 1156
  11. 1681
  12. 9216
  13. 3364
  14. 2209
  15. 7056
  16. 9025
  17. 1444
  18. 2916
  19. 2401
  20. 1089
  21. 7225
  22. 4489
  23. 4761
  24. 3721
  25. 6241
  26. 5329
  27. 8464
  28. 3969
  29. 5776
  30. 1936
  31. 4096
  32. 9801
  33. 3025
  34. 1225
  35. 3481
  36. 9409
  37. 7569
  38. 5929
  39. 1296
  40. 3249

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