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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 634 · 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. 1.81² =
  2. 2.59² =
  3. 3.65² =
  4. 4.69² =
  5. 5.89² =
  6. 6.45² =
  7. 7.33² =
  8. 8.71² =
  9. 9.58² =
  10. 10.32² =
  11. 11.68² =
  12. 12.96² =
  13. 13.34² =
  14. 14.63² =
  15. 15.79² =
  16. 16.41² =
  17. 17.31² =
  18. 18.47² =
  19. 19.86² =
  20. 20.93² =
  21. 21.44² =
  22. 22.36² =
  23. 23.52² =
  24. 24.51² =
  25. 25.85² =
  26. 26.37² =
  27. 27.42² =
  28. 28.39² =
  29. 29.88² =
  30. 30.57² =
  31. 31.83² =
  32. 32.73² =
  33. 33.43² =
  34. 34.53² =
  35. 35.55² =
  36. 36.78² =
  37. 37.46² =
  38. 38.99² =
  39. 39.95² =
  40. 40.91² =

Answer key

  1. 6561
  2. 3481
  3. 4225
  4. 4761
  5. 7921
  6. 2025
  7. 1089
  8. 5041
  9. 3364
  10. 1024
  11. 4624
  12. 9216
  13. 1156
  14. 3969
  15. 6241
  16. 1681
  17. 961
  18. 2209
  19. 7396
  20. 8649
  21. 1936
  22. 1296
  23. 2704
  24. 2601
  25. 7225
  26. 1369
  27. 1764
  28. 1521
  29. 7744
  30. 3249
  31. 6889
  32. 5329
  33. 1849
  34. 2809
  35. 3025
  36. 6084
  37. 2116
  38. 9801
  39. 9025
  40. 8281

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