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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 758 · 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. 1.87² =
  2. 2.41² =
  3. 3.58² =
  4. 4.92² =
  5. 5.37² =
  6. 6.61² =
  7. 7.99² =
  8. 8.74² =
  9. 9.89² =
  10. 10.43² =
  11. 11.39² =
  12. 12.53² =
  13. 13.34² =
  14. 14.81² =
  15. 15.45² =
  16. 16.82² =
  17. 17.75² =
  18. 18.96² =
  19. 19.73² =
  20. 20.69² =
  21. 21.51² =
  22. 22.66² =
  23. 23.68² =
  24. 24.64² =
  25. 25.42² =
  26. 26.85² =
  27. 27.94² =
  28. 28.62² =
  29. 29.77² =
  30. 30.55² =
  31. 31.56² =
  32. 32.67² =
  33. 33.71² =
  34. 34.32² =
  35. 35.31² =
  36. 36.52² =
  37. 37.83² =
  38. 38.84² =
  39. 39.93² =
  40. 40.97² =

Answer key

  1. 7569
  2. 1681
  3. 3364
  4. 8464
  5. 1369
  6. 3721
  7. 9801
  8. 5476
  9. 7921
  10. 1849
  11. 1521
  12. 2809
  13. 1156
  14. 6561
  15. 2025
  16. 6724
  17. 5625
  18. 9216
  19. 5329
  20. 4761
  21. 2601
  22. 4356
  23. 4624
  24. 4096
  25. 1764
  26. 7225
  27. 8836
  28. 3844
  29. 5929
  30. 3025
  31. 3136
  32. 4489
  33. 5041
  34. 1024
  35. 961
  36. 2704
  37. 6889
  38. 7056
  39. 8649
  40. 9409

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