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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 281 · 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. 1.61² =
  2. 2.91² =
  3. 3.48² =
  4. 4.78² =
  5. 5.81² =
  6. 6.86² =
  7. 7.37² =
  8. 8.36² =
  9. 9.63² =
  10. 10.93² =
  11. 11.77² =
  12. 12.51² =
  13. 13.65² =
  14. 14.76² =
  15. 15.74² =
  16. 16.94² =
  17. 17.38² =
  18. 18.66² =
  19. 19.44² =
  20. 20.82² =
  21. 21.83² =
  22. 22.99² =
  23. 23.72² =
  24. 24.55² =
  25. 25.89² =
  26. 26.84² =
  27. 27.73² =
  28. 28.87² =
  29. 29.43² =
  30. 30.62² =
  31. 31.45² =
  32. 32.32² =
  33. 33.42² =
  34. 34.59² =
  35. 35.41² =
  36. 36.92² =
  37. 37.34² =
  38. 38.98² =
  39. 39.35² =
  40. 40.65² =

Answer key

  1. 3721
  2. 8281
  3. 2304
  4. 6084
  5. 6561
  6. 7396
  7. 1369
  8. 1296
  9. 3969
  10. 8649
  11. 5929
  12. 2601
  13. 4225
  14. 5776
  15. 5476
  16. 8836
  17. 1444
  18. 4356
  19. 1936
  20. 6724
  21. 6889
  22. 9801
  23. 5184
  24. 3025
  25. 7921
  26. 7056
  27. 5329
  28. 7569
  29. 1849
  30. 3844
  31. 2025
  32. 1024
  33. 1764
  34. 3481
  35. 1681
  36. 8464
  37. 1156
  38. 9604
  39. 1225
  40. 4225

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