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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 862 · 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. 1.99² =
  2. 2.62² =
  3. 3.79² =
  4. 4.59² =
  5. 5.39² =
  6. 6.34² =
  7. 7.31² =
  8. 8.43² =
  9. 9.53² =
  10. 10.98² =
  11. 11.48² =
  12. 12.92² =
  13. 13.74² =
  14. 14.72² =
  15. 15.61² =
  16. 16.85² =
  17. 17.56² =
  18. 18.87² =
  19. 19.97² =
  20. 20.63² =
  21. 21.44² =
  22. 22.91² =
  23. 23.69² =
  24. 24.94² =
  25. 25.81² =
  26. 26.54² =
  27. 27.32² =
  28. 28.86² =
  29. 29.38² =
  30. 30.41² =
  31. 31.76² =
  32. 32.68² =
  33. 33.36² =
  34. 34.89² =
  35. 35.49² =
  36. 36.35² =
  37. 37.77² =
  38. 38.45² =
  39. 39.73² =
  40. 40.93² =

Answer key

  1. 9801
  2. 3844
  3. 6241
  4. 3481
  5. 1521
  6. 1156
  7. 961
  8. 1849
  9. 2809
  10. 9604
  11. 2304
  12. 8464
  13. 5476
  14. 5184
  15. 3721
  16. 7225
  17. 3136
  18. 7569
  19. 9409
  20. 3969
  21. 1936
  22. 8281
  23. 4761
  24. 8836
  25. 6561
  26. 2916
  27. 1024
  28. 7396
  29. 1444
  30. 1681
  31. 5776
  32. 4624
  33. 1296
  34. 7921
  35. 2401
  36. 1225
  37. 5929
  38. 2025
  39. 5329
  40. 8649

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