← 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 579 · 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. 1.73² =
  2. 2.75² =
  3. 3.91² =
  4. 4.59² =
  5. 5.74² =
  6. 6.49² =
  7. 7.61² =
  8. 8.45² =
  9. 9.67² =
  10. 10.82² =
  11. 11.96² =
  12. 12.94² =
  13. 13.34² =
  14. 14.98² =
  15. 15.86² =
  16. 16.42² =
  17. 17.57² =
  18. 18.87² =
  19. 19.31² =
  20. 20.88² =
  21. 21.72² =
  22. 22.89² =
  23. 23.32² =
  24. 24.99² =
  25. 25.62² =
  26. 26.36² =
  27. 27.65² =
  28. 28.54² =
  29. 29.78² =
  30. 30.68² =
  31. 31.53² =
  32. 32.51² =
  33. 33.81² =
  34. 34.39² =
  35. 35.64² =
  36. 36.44² =
  37. 37.76² =
  38. 38.41² =
  39. 39.84² =
  40. 40.93² =

Answer key

  1. 5329
  2. 5625
  3. 8281
  4. 3481
  5. 5476
  6. 2401
  7. 3721
  8. 2025
  9. 4489
  10. 6724
  11. 9216
  12. 8836
  13. 1156
  14. 9604
  15. 7396
  16. 1764
  17. 3249
  18. 7569
  19. 961
  20. 7744
  21. 5184
  22. 7921
  23. 1024
  24. 9801
  25. 3844
  26. 1296
  27. 4225
  28. 2916
  29. 6084
  30. 4624
  31. 2809
  32. 2601
  33. 6561
  34. 1521
  35. 4096
  36. 1936
  37. 5776
  38. 1681
  39. 7056
  40. 8649

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