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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 682 · 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. 1.96² =
  2. 2.56² =
  3. 3.81² =
  4. 4.39² =
  5. 5.72² =
  6. 6.62² =
  7. 7.71² =
  8. 8.43² =
  9. 9.77² =
  10. 10.58² =
  11. 11.44² =
  12. 12.51² =
  13. 13.41² =
  14. 14.57² =
  15. 15.61² =
  16. 16.82² =
  17. 17.97² =
  18. 18.55² =
  19. 19.91² =
  20. 20.34² =
  21. 21.46² =
  22. 22.36² =
  23. 23.47² =
  24. 24.52² =
  25. 25.63² =
  26. 26.37² =
  27. 27.68² =
  28. 28.87² =
  29. 29.73² =
  30. 30.89² =
  31. 31.54² =
  32. 32.53² =
  33. 33.33² =
  34. 34.31² =
  35. 35.84² =
  36. 36.76² =
  37. 37.59² =
  38. 38.35² =
  39. 39.95² =
  40. 40.93² =

Answer key

  1. 9216
  2. 3136
  3. 6561
  4. 1521
  5. 5184
  6. 3844
  7. 5041
  8. 1849
  9. 5929
  10. 3364
  11. 1936
  12. 2601
  13. 1681
  14. 3249
  15. 3721
  16. 6724
  17. 9409
  18. 3025
  19. 8281
  20. 1156
  21. 2116
  22. 1296
  23. 2209
  24. 2704
  25. 3969
  26. 1369
  27. 4624
  28. 7569
  29. 5329
  30. 7921
  31. 2916
  32. 2809
  33. 1089
  34. 961
  35. 7056
  36. 5776
  37. 3481
  38. 1225
  39. 9025
  40. 8649

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