← 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 458 · 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. 1.64² =
  2. 2.91² =
  3. 3.45² =
  4. 4.49² =
  5. 5.85² =
  6. 6.76² =
  7. 7.98² =
  8. 8.33² =
  9. 9.52² =
  10. 10.35² =
  11. 11.42² =
  12. 12.83² =
  13. 13.78² =
  14. 14.43² =
  15. 15.38² =
  16. 16.57² =
  17. 17.36² =
  18. 18.99² =
  19. 19.34² =
  20. 20.39² =
  21. 21.66² =
  22. 22.77² =
  23. 23.81² =
  24. 24.88² =
  25. 25.72² =
  26. 26.59² =
  27. 27.61² =
  28. 28.58² =
  29. 29.97² =
  30. 30.79² =
  31. 31.84² =
  32. 32.62² =
  33. 33.51² =
  34. 34.65² =
  35. 35.63² =
  36. 36.68² =
  37. 37.87² =
  38. 38.75² =
  39. 39.41² =
  40. 40.86² =

Answer key

  1. 4096
  2. 8281
  3. 2025
  4. 2401
  5. 7225
  6. 5776
  7. 9604
  8. 1089
  9. 2704
  10. 1225
  11. 1764
  12. 6889
  13. 6084
  14. 1849
  15. 1444
  16. 3249
  17. 1296
  18. 9801
  19. 1156
  20. 1521
  21. 4356
  22. 5929
  23. 6561
  24. 7744
  25. 5184
  26. 3481
  27. 3721
  28. 3364
  29. 9409
  30. 6241
  31. 7056
  32. 3844
  33. 2601
  34. 4225
  35. 3969
  36. 4624
  37. 7569
  38. 5625
  39. 1681
  40. 7396

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