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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 776 · 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. 1.65² =
  2. 2.39² =
  3. 3.57² =
  4. 4.31² =
  5. 5.58² =
  6. 6.55² =
  7. 7.44² =
  8. 8.56² =
  9. 9.54² =
  10. 10.62² =
  11. 11.96² =
  12. 12.85² =
  13. 13.73² =
  14. 14.51² =
  15. 15.41² =
  16. 16.91² =
  17. 17.79² =
  18. 18.95² =
  19. 19.97² =
  20. 20.84² =
  21. 21.34² =
  22. 22.87² =
  23. 23.81² =
  24. 24.37² =
  25. 25.98² =
  26. 26.42² =
  27. 27.82² =
  28. 28.77² =
  29. 29.75² =
  30. 30.66² =
  31. 31.45² =
  32. 32.61² =
  33. 33.88² =
  34. 34.47² =
  35. 35.69² =
  36. 36.67² =
  37. 37.68² =
  38. 38.83² =
  39. 39.86² =
  40. 40.53² =

Answer key

  1. 4225
  2. 1521
  3. 3249
  4. 961
  5. 3364
  6. 3025
  7. 1936
  8. 3136
  9. 2916
  10. 3844
  11. 9216
  12. 7225
  13. 5329
  14. 2601
  15. 1681
  16. 8281
  17. 6241
  18. 9025
  19. 9409
  20. 7056
  21. 1156
  22. 7569
  23. 6561
  24. 1369
  25. 9604
  26. 1764
  27. 6724
  28. 5929
  29. 5625
  30. 4356
  31. 2025
  32. 3721
  33. 7744
  34. 2209
  35. 4761
  36. 4489
  37. 4624
  38. 6889
  39. 7396
  40. 2809

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