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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 243 · 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. 1.51² =
  2. 2.85² =
  3. 3.88² =
  4. 4.76² =
  5. 5.48² =
  6. 6.91² =
  7. 7.44² =
  8. 8.35² =
  9. 9.92² =
  10. 10.81² =
  11. 11.93² =
  12. 12.71² =
  13. 13.75² =
  14. 14.89² =
  15. 15.37² =
  16. 16.36² =
  17. 17.56² =
  18. 18.77² =
  19. 19.46² =
  20. 20.97² =
  21. 21.32² =
  22. 22.73² =
  23. 23.62² =
  24. 24.87² =
  25. 25.34² =
  26. 26.66² =
  27. 27.42² =
  28. 28.31² =
  29. 29.83² =
  30. 30.33² =
  31. 31.54² =
  32. 32.69² =
  33. 33.41² =
  34. 34.52² =
  35. 35.68² =
  36. 36.84² =
  37. 37.94² =
  38. 38.74² =
  39. 39.61² =
  40. 40.57² =

Answer key

  1. 2601
  2. 7225
  3. 7744
  4. 5776
  5. 2304
  6. 8281
  7. 1936
  8. 1225
  9. 8464
  10. 6561
  11. 8649
  12. 5041
  13. 5625
  14. 7921
  15. 1369
  16. 1296
  17. 3136
  18. 5929
  19. 2116
  20. 9409
  21. 1024
  22. 5329
  23. 3844
  24. 7569
  25. 1156
  26. 4356
  27. 1764
  28. 961
  29. 6889
  30. 1089
  31. 2916
  32. 4761
  33. 1681
  34. 2704
  35. 4624
  36. 7056
  37. 8836
  38. 5476
  39. 3721
  40. 3249

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