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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 668 · 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. 1.62² =
  2. 2.87² =
  3. 3.72² =
  4. 4.33² =
  5. 5.77² =
  6. 6.43² =
  7. 7.44² =
  8. 8.53² =
  9. 9.73² =
  10. 10.35² =
  11. 11.57² =
  12. 12.94² =
  13. 13.49² =
  14. 14.89² =
  15. 15.79² =
  16. 16.85² =
  17. 17.41² =
  18. 18.95² =
  19. 19.46² =
  20. 20.98² =
  21. 21.88² =
  22. 22.81² =
  23. 23.38² =
  24. 24.63² =
  25. 25.55² =
  26. 26.56² =
  27. 27.65² =
  28. 28.37² =
  29. 29.48² =
  30. 30.34² =
  31. 31.92² =
  32. 32.96² =
  33. 33.36² =
  34. 34.52² =
  35. 35.61² =
  36. 36.54² =
  37. 37.68² =
  38. 38.76² =
  39. 39.99² =
  40. 40.83² =

Answer key

  1. 3844
  2. 7569
  3. 5184
  4. 1089
  5. 5929
  6. 1849
  7. 1936
  8. 2809
  9. 5329
  10. 1225
  11. 3249
  12. 8836
  13. 2401
  14. 7921
  15. 6241
  16. 7225
  17. 1681
  18. 9025
  19. 2116
  20. 9604
  21. 7744
  22. 6561
  23. 1444
  24. 3969
  25. 3025
  26. 3136
  27. 4225
  28. 1369
  29. 2304
  30. 1156
  31. 8464
  32. 9216
  33. 1296
  34. 2704
  35. 3721
  36. 2916
  37. 4624
  38. 5776
  39. 9801
  40. 6889

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