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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 499 · 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. 1.79² =
  2. 2.45² =
  3. 3.71² =
  4. 4.34² =
  5. 5.57² =
  6. 6.33² =
  7. 7.85² =
  8. 8.38² =
  9. 9.97² =
  10. 10.49² =
  11. 11.99² =
  12. 12.44² =
  13. 13.61² =
  14. 14.68² =
  15. 15.58² =
  16. 16.83² =
  17. 17.41² =
  18. 18.46² =
  19. 19.69² =
  20. 20.63² =
  21. 21.52² =
  22. 22.88² =
  23. 23.66² =
  24. 24.32² =
  25. 25.94² =
  26. 26.54² =
  27. 27.36² =
  28. 28.77² =
  29. 29.51² =
  30. 30.42² =
  31. 31.64² =
  32. 32.43² =
  33. 33.56² =
  34. 34.87² =
  35. 35.98² =
  36. 36.31² =
  37. 37.39² =
  38. 38.59² =
  39. 39.75² =
  40. 40.86² =

Answer key

  1. 6241
  2. 2025
  3. 5041
  4. 1156
  5. 3249
  6. 1089
  7. 7225
  8. 1444
  9. 9409
  10. 2401
  11. 9801
  12. 1936
  13. 3721
  14. 4624
  15. 3364
  16. 6889
  17. 1681
  18. 2116
  19. 4761
  20. 3969
  21. 2704
  22. 7744
  23. 4356
  24. 1024
  25. 8836
  26. 2916
  27. 1296
  28. 5929
  29. 2601
  30. 1764
  31. 4096
  32. 1849
  33. 3136
  34. 7569
  35. 9604
  36. 961
  37. 1521
  38. 3481
  39. 5625
  40. 7396

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