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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 95 · 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. 1.51² =
  2. 2.73² =
  3. 3.65² =
  4. 4.81² =
  5. 5.53² =
  6. 6.74² =
  7. 7.41² =
  8. 8.58² =
  9. 9.46² =
  10. 10.34² =
  11. 11.36² =
  12. 12.42² =
  13. 13.44² =
  14. 14.72² =
  15. 15.67² =
  16. 16.49² =
  17. 17.35² =
  18. 18.69² =
  19. 19.92² =
  20. 20.83² =
  21. 21.61² =
  22. 22.39² =
  23. 23.48² =
  24. 24.37² =
  25. 25.97² =
  26. 26.77² =
  27. 27.78² =
  28. 28.52² =
  29. 29.68² =
  30. 30.93² =
  31. 31.75² =
  32. 32.64² =
  33. 33.47² =
  34. 34.56² =
  35. 35.63² =
  36. 36.32² =
  37. 37.95² =
  38. 38.55² =
  39. 39.59² =
  40. 40.38² =

Answer key

  1. 2601
  2. 5329
  3. 4225
  4. 6561
  5. 2809
  6. 5476
  7. 1681
  8. 3364
  9. 2116
  10. 1156
  11. 1296
  12. 1764
  13. 1936
  14. 5184
  15. 4489
  16. 2401
  17. 1225
  18. 4761
  19. 8464
  20. 6889
  21. 3721
  22. 1521
  23. 2304
  24. 1369
  25. 9409
  26. 5929
  27. 6084
  28. 2704
  29. 4624
  30. 8649
  31. 5625
  32. 4096
  33. 2209
  34. 3136
  35. 3969
  36. 1024
  37. 9025
  38. 3025
  39. 3481
  40. 1444

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