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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 697 · 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. 1.94² =
  2. 2.56² =
  3. 3.44² =
  4. 4.51² =
  5. 5.33² =
  6. 6.72² =
  7. 7.39² =
  8. 8.36² =
  9. 9.73² =
  10. 10.74² =
  11. 11.42² =
  12. 12.82² =
  13. 13.69² =
  14. 14.62² =
  15. 15.83² =
  16. 16.59² =
  17. 17.99² =
  18. 18.89² =
  19. 19.95² =
  20. 20.43² =
  21. 21.93² =
  22. 22.58² =
  23. 23.32² =
  24. 24.46² =
  25. 25.97² =
  26. 26.38² =
  27. 27.37² =
  28. 28.75² =
  29. 29.61² =
  30. 30.53² =
  31. 31.64² =
  32. 32.77² =
  33. 33.71² =
  34. 34.65² =
  35. 35.96² =
  36. 36.41² =
  37. 37.54² =
  38. 38.85² =
  39. 39.81² =
  40. 40.63² =

Answer key

  1. 8836
  2. 3136
  3. 1936
  4. 2601
  5. 1089
  6. 5184
  7. 1521
  8. 1296
  9. 5329
  10. 5476
  11. 1764
  12. 6724
  13. 4761
  14. 3844
  15. 6889
  16. 3481
  17. 9801
  18. 7921
  19. 9025
  20. 1849
  21. 8649
  22. 3364
  23. 1024
  24. 2116
  25. 9409
  26. 1444
  27. 1369
  28. 5625
  29. 3721
  30. 2809
  31. 4096
  32. 5929
  33. 5041
  34. 4225
  35. 9216
  36. 1681
  37. 2916
  38. 7225
  39. 6561
  40. 3969

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