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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 156 · 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. 1.42² =
  2. 2.41² =
  3. 3.68² =
  4. 4.81² =
  5. 5.59² =
  6. 6.49² =
  7. 7.93² =
  8. 8.52² =
  9. 9.61² =
  10. 10.86² =
  11. 11.83² =
  12. 12.47² =
  13. 13.34² =
  14. 14.45² =
  15. 15.58² =
  16. 16.57² =
  17. 17.37² =
  18. 18.98² =
  19. 19.95² =
  20. 20.44² =
  21. 21.94² =
  22. 22.96² =
  23. 23.63² =
  24. 24.84² =
  25. 25.38² =
  26. 26.75² =
  27. 27.62² =
  28. 28.97² =
  29. 29.43² =
  30. 30.54² =
  31. 31.82² =
  32. 32.31² =
  33. 33.77² =
  34. 34.78² =
  35. 35.33² =
  36. 36.91² =
  37. 37.46² =
  38. 38.53² =
  39. 39.55² =
  40. 40.51² =

Answer key

  1. 1764
  2. 1681
  3. 4624
  4. 6561
  5. 3481
  6. 2401
  7. 8649
  8. 2704
  9. 3721
  10. 7396
  11. 6889
  12. 2209
  13. 1156
  14. 2025
  15. 3364
  16. 3249
  17. 1369
  18. 9604
  19. 9025
  20. 1936
  21. 8836
  22. 9216
  23. 3969
  24. 7056
  25. 1444
  26. 5625
  27. 3844
  28. 9409
  29. 1849
  30. 2916
  31. 6724
  32. 961
  33. 5929
  34. 6084
  35. 1089
  36. 8281
  37. 2116
  38. 2809
  39. 3025
  40. 2601

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