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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 965 · 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. 1.82² =
  2. 2.88² =
  3. 3.85² =
  4. 4.37² =
  5. 5.74² =
  6. 6.42² =
  7. 7.58² =
  8. 8.44² =
  9. 9.93² =
  10. 10.71² =
  11. 11.75² =
  12. 12.91² =
  13. 13.45² =
  14. 14.56² =
  15. 15.97² =
  16. 16.66² =
  17. 17.52² =
  18. 18.83² =
  19. 19.51² =
  20. 20.36² =
  21. 21.64² =
  22. 22.46² =
  23. 23.73² =
  24. 24.43² =
  25. 25.39² =
  26. 26.31² =
  27. 27.68² =
  28. 28.63² =
  29. 29.41² =
  30. 30.94² =
  31. 31.84² =
  32. 32.67² =
  33. 33.92² =
  34. 34.49² =
  35. 35.47² =
  36. 36.33² =
  37. 37.77² =
  38. 38.78² =
  39. 39.87² =
  40. 40.81² =

Answer key

  1. 6724
  2. 7744
  3. 7225
  4. 1369
  5. 5476
  6. 1764
  7. 3364
  8. 1936
  9. 8649
  10. 5041
  11. 5625
  12. 8281
  13. 2025
  14. 3136
  15. 9409
  16. 4356
  17. 2704
  18. 6889
  19. 2601
  20. 1296
  21. 4096
  22. 2116
  23. 5329
  24. 1849
  25. 1521
  26. 961
  27. 4624
  28. 3969
  29. 1681
  30. 8836
  31. 7056
  32. 4489
  33. 8464
  34. 2401
  35. 2209
  36. 1089
  37. 5929
  38. 6084
  39. 7569
  40. 6561

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