← 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 398 · 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. 1.92² =
  2. 2.41² =
  3. 3.47² =
  4. 4.43² =
  5. 5.54² =
  6. 6.32² =
  7. 7.34² =
  8. 8.46² =
  9. 9.56² =
  10. 10.49² =
  11. 11.68² =
  12. 12.98² =
  13. 13.57² =
  14. 14.99² =
  15. 15.61² =
  16. 16.83² =
  17. 17.51² =
  18. 18.39² =
  19. 19.89² =
  20. 20.63² =
  21. 21.62² =
  22. 22.85² =
  23. 23.33² =
  24. 24.91² =
  25. 25.36² =
  26. 26.45² =
  27. 27.72² =
  28. 28.82² =
  29. 29.71² =
  30. 30.37² =
  31. 31.55² =
  32. 32.77² =
  33. 33.79² =
  34. 34.81² =
  35. 35.74² =
  36. 36.75² =
  37. 37.52² =
  38. 38.95² =
  39. 39.35² =
  40. 40.87² =

Answer key

  1. 8464
  2. 1681
  3. 2209
  4. 1849
  5. 2916
  6. 1024
  7. 1156
  8. 2116
  9. 3136
  10. 2401
  11. 4624
  12. 9604
  13. 3249
  14. 9801
  15. 3721
  16. 6889
  17. 2601
  18. 1521
  19. 7921
  20. 3969
  21. 3844
  22. 7225
  23. 1089
  24. 8281
  25. 1296
  26. 2025
  27. 5184
  28. 6724
  29. 5041
  30. 1369
  31. 3025
  32. 5929
  33. 6241
  34. 6561
  35. 5476
  36. 5625
  37. 2704
  38. 9025
  39. 1225
  40. 7569

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