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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 517 · 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. 1.36² =
  2. 2.79² =
  3. 3.48² =
  4. 4.63² =
  5. 5.87² =
  6. 6.41² =
  7. 7.49² =
  8. 8.88² =
  9. 9.84² =
  10. 10.74² =
  11. 11.39² =
  12. 12.89² =
  13. 13.56² =
  14. 14.51² =
  15. 15.81² =
  16. 16.34² =
  17. 17.71² =
  18. 18.54² =
  19. 19.68² =
  20. 20.86² =
  21. 21.93² =
  22. 22.35² =
  23. 23.77² =
  24. 24.57² =
  25. 25.31² =
  26. 26.82² =
  27. 27.44² =
  28. 28.95² =
  29. 29.45² =
  30. 30.97² =
  31. 31.58² =
  32. 32.85² =
  33. 33.73² =
  34. 34.37² =
  35. 35.67² =
  36. 36.62² =
  37. 37.61² =
  38. 38.52² =
  39. 39.92² =
  40. 40.55² =

Answer key

  1. 1296
  2. 6241
  3. 2304
  4. 3969
  5. 7569
  6. 1681
  7. 2401
  8. 7744
  9. 7056
  10. 5476
  11. 1521
  12. 7921
  13. 3136
  14. 2601
  15. 6561
  16. 1156
  17. 5041
  18. 2916
  19. 4624
  20. 7396
  21. 8649
  22. 1225
  23. 5929
  24. 3249
  25. 961
  26. 6724
  27. 1936
  28. 9025
  29. 2025
  30. 9409
  31. 3364
  32. 7225
  33. 5329
  34. 1369
  35. 4489
  36. 3844
  37. 3721
  38. 2704
  39. 8464
  40. 3025

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