← 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 570 · 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. 1.88² =
  2. 2.53² =
  3. 3.86² =
  4. 4.61² =
  5. 5.73² =
  6. 6.98² =
  7. 7.33² =
  8. 8.81² =
  9. 9.82² =
  10. 10.38² =
  11. 11.31² =
  12. 12.63² =
  13. 13.49² =
  14. 14.77² =
  15. 15.89² =
  16. 16.46² =
  17. 17.58² =
  18. 18.37² =
  19. 19.43² =
  20. 20.67² =
  21. 21.47² =
  22. 22.54² =
  23. 23.94² =
  24. 24.72² =
  25. 25.85² =
  26. 26.34² =
  27. 27.99² =
  28. 28.56² =
  29. 29.41² =
  30. 30.44² =
  31. 31.93² =
  32. 32.79² =
  33. 33.32² =
  34. 34.91² =
  35. 35.39² =
  36. 36.57² =
  37. 37.87² =
  38. 38.42² =
  39. 39.92² =
  40. 40.71² =

Answer key

  1. 7744
  2. 2809
  3. 7396
  4. 3721
  5. 5329
  6. 9604
  7. 1089
  8. 6561
  9. 6724
  10. 1444
  11. 961
  12. 3969
  13. 2401
  14. 5929
  15. 7921
  16. 2116
  17. 3364
  18. 1369
  19. 1849
  20. 4489
  21. 2209
  22. 2916
  23. 8836
  24. 5184
  25. 7225
  26. 1156
  27. 9801
  28. 3136
  29. 1681
  30. 1936
  31. 8649
  32. 6241
  33. 1024
  34. 8281
  35. 1521
  36. 3249
  37. 7569
  38. 1764
  39. 8464
  40. 5041

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