← 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 534 · 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. 1.53² =
  2. 2.34² =
  3. 3.64² =
  4. 4.71² =
  5. 5.76² =
  6. 6.52² =
  7. 7.67² =
  8. 8.33² =
  9. 9.68² =
  10. 10.46² =
  11. 11.72² =
  12. 12.95² =
  13. 13.65² =
  14. 14.74² =
  15. 15.93² =
  16. 16.78² =
  17. 17.63² =
  18. 18.41² =
  19. 19.43² =
  20. 20.42² =
  21. 21.45² =
  22. 22.81² =
  23. 23.54² =
  24. 24.49² =
  25. 25.35² =
  26. 26.91² =
  27. 27.36² =
  28. 28.84² =
  29. 29.77² =
  30. 30.61² =
  31. 31.79² =
  32. 32.57² =
  33. 33.85² =
  34. 34.31² =
  35. 35.88² =
  36. 36.44² =
  37. 37.89² =
  38. 38.73² =
  39. 39.56² =
  40. 40.37² =

Answer key

  1. 2809
  2. 1156
  3. 4096
  4. 5041
  5. 5776
  6. 2704
  7. 4489
  8. 1089
  9. 4624
  10. 2116
  11. 5184
  12. 9025
  13. 4225
  14. 5476
  15. 8649
  16. 6084
  17. 3969
  18. 1681
  19. 1849
  20. 1764
  21. 2025
  22. 6561
  23. 2916
  24. 2401
  25. 1225
  26. 8281
  27. 1296
  28. 7056
  29. 5929
  30. 3721
  31. 6241
  32. 3249
  33. 7225
  34. 961
  35. 7744
  36. 1936
  37. 7921
  38. 5329
  39. 3136
  40. 1369

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