← 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 768 · 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. 1.54² =
  2. 2.47² =
  3. 3.77² =
  4. 4.34² =
  5. 5.68² =
  6. 6.93² =
  7. 7.46² =
  8. 8.49² =
  9. 9.73² =
  10. 10.44² =
  11. 11.62² =
  12. 12.86² =
  13. 13.57² =
  14. 14.51² =
  15. 15.66² =
  16. 16.61² =
  17. 17.45² =
  18. 18.39² =
  19. 19.67² =
  20. 20.83² =
  21. 21.71² =
  22. 22.35² =
  23. 23.36² =
  24. 24.43² =
  25. 25.64² =
  26. 26.85² =
  27. 27.33² =
  28. 28.65² =
  29. 29.99² =
  30. 30.42² =
  31. 31.95² =
  32. 32.41² =
  33. 33.74² =
  34. 34.78² =
  35. 35.37² =
  36. 36.89² =
  37. 37.97² =
  38. 38.53² =
  39. 39.92² =
  40. 40.84² =

Answer key

  1. 2916
  2. 2209
  3. 5929
  4. 1156
  5. 4624
  6. 8649
  7. 2116
  8. 2401
  9. 5329
  10. 1936
  11. 3844
  12. 7396
  13. 3249
  14. 2601
  15. 4356
  16. 3721
  17. 2025
  18. 1521
  19. 4489
  20. 6889
  21. 5041
  22. 1225
  23. 1296
  24. 1849
  25. 4096
  26. 7225
  27. 1089
  28. 4225
  29. 9801
  30. 1764
  31. 9025
  32. 1681
  33. 5476
  34. 6084
  35. 1369
  36. 7921
  37. 9409
  38. 2809
  39. 8464
  40. 7056

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