← 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 645 · 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. 1.49² =
  2. 2.89² =
  3. 3.71² =
  4. 4.41² =
  5. 5.92² =
  6. 6.57² =
  7. 7.33² =
  8. 8.78² =
  9. 9.72² =
  10. 10.77² =
  11. 11.99² =
  12. 12.39² =
  13. 13.88² =
  14. 14.59² =
  15. 15.37² =
  16. 16.79² =
  17. 17.75² =
  18. 18.31² =
  19. 19.67² =
  20. 20.38² =
  21. 21.65² =
  22. 22.64² =
  23. 23.87² =
  24. 24.93² =
  25. 25.36² =
  26. 26.34² =
  27. 27.58² =
  28. 28.51² =
  29. 29.47² =
  30. 30.76² =
  31. 31.73² =
  32. 32.61² =
  33. 33.43² =
  34. 34.81² =
  35. 35.74² =
  36. 36.35² =
  37. 37.42² =
  38. 38.62² =
  39. 39.46² =
  40. 40.53² =

Answer key

  1. 2401
  2. 7921
  3. 5041
  4. 1681
  5. 8464
  6. 3249
  7. 1089
  8. 6084
  9. 5184
  10. 5929
  11. 9801
  12. 1521
  13. 7744
  14. 3481
  15. 1369
  16. 6241
  17. 5625
  18. 961
  19. 4489
  20. 1444
  21. 4225
  22. 4096
  23. 7569
  24. 8649
  25. 1296
  26. 1156
  27. 3364
  28. 2601
  29. 2209
  30. 5776
  31. 5329
  32. 3721
  33. 1849
  34. 6561
  35. 5476
  36. 1225
  37. 1764
  38. 3844
  39. 2116
  40. 2809

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