← 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 876 · 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. 1.83² =
  2. 2.71² =
  3. 3.44² =
  4. 4.42² =
  5. 5.78² =
  6. 6.57² =
  7. 7.54² =
  8. 8.73² =
  9. 9.33² =
  10. 10.76² =
  11. 11.31² =
  12. 12.55² =
  13. 13.92² =
  14. 14.34² =
  15. 15.61² =
  16. 16.47² =
  17. 17.36² =
  18. 18.95² =
  19. 19.46² =
  20. 20.58² =
  21. 21.45² =
  22. 22.38² =
  23. 23.35² =
  24. 24.97² =
  25. 25.99² =
  26. 26.37² =
  27. 27.32² =
  28. 28.81² =
  29. 29.49² =
  30. 30.51² =
  31. 31.56² =
  32. 32.82² =
  33. 33.96² =
  34. 34.94² =
  35. 35.79² =
  36. 36.43² =
  37. 37.77² =
  38. 38.87² =
  39. 39.88² =
  40. 40.85² =

Answer key

  1. 6889
  2. 5041
  3. 1936
  4. 1764
  5. 6084
  6. 3249
  7. 2916
  8. 5329
  9. 1089
  10. 5776
  11. 961
  12. 3025
  13. 8464
  14. 1156
  15. 3721
  16. 2209
  17. 1296
  18. 9025
  19. 2116
  20. 3364
  21. 2025
  22. 1444
  23. 1225
  24. 9409
  25. 9801
  26. 1369
  27. 1024
  28. 6561
  29. 2401
  30. 2601
  31. 3136
  32. 6724
  33. 9216
  34. 8836
  35. 6241
  36. 1849
  37. 5929
  38. 7569
  39. 7744
  40. 7225

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