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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 251 · 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. 1.34² =
  2. 2.62² =
  3. 3.99² =
  4. 4.41² =
  5. 5.31² =
  6. 6.91² =
  7. 7.47² =
  8. 8.64² =
  9. 9.73² =
  10. 10.68² =
  11. 11.65² =
  12. 12.43² =
  13. 13.38² =
  14. 14.58² =
  15. 15.54² =
  16. 16.89² =
  17. 17.55² =
  18. 18.39² =
  19. 19.86² =
  20. 20.88² =
  21. 21.42² =
  22. 22.76² =
  23. 23.45² =
  24. 24.69² =
  25. 25.94² =
  26. 26.35² =
  27. 27.57² =
  28. 28.51² =
  29. 29.59² =
  30. 30.75² =
  31. 31.92² =
  32. 32.82² =
  33. 33.56² =
  34. 34.79² =
  35. 35.63² =
  36. 36.87² =
  37. 37.37² =
  38. 38.77² =
  39. 39.95² =
  40. 40.96² =

Answer key

  1. 1156
  2. 3844
  3. 9801
  4. 1681
  5. 961
  6. 8281
  7. 2209
  8. 4096
  9. 5329
  10. 4624
  11. 4225
  12. 1849
  13. 1444
  14. 3364
  15. 2916
  16. 7921
  17. 3025
  18. 1521
  19. 7396
  20. 7744
  21. 1764
  22. 5776
  23. 2025
  24. 4761
  25. 8836
  26. 1225
  27. 3249
  28. 2601
  29. 3481
  30. 5625
  31. 8464
  32. 6724
  33. 3136
  34. 6241
  35. 3969
  36. 7569
  37. 1369
  38. 5929
  39. 9025
  40. 9216

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