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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 865 · 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. 1.54² =
  2. 2.79² =
  3. 3.31² =
  4. 4.85² =
  5. 5.73² =
  6. 6.92² =
  7. 7.49² =
  8. 8.61² =
  9. 9.87² =
  10. 10.41² =
  11. 11.98² =
  12. 12.57² =
  13. 13.65² =
  14. 14.35² =
  15. 15.82² =
  16. 16.94² =
  17. 17.59² =
  18. 18.77² =
  19. 19.38² =
  20. 20.53² =
  21. 21.45² =
  22. 22.33² =
  23. 23.97² =
  24. 24.91² =
  25. 25.47² =
  26. 26.39² =
  27. 27.74² =
  28. 28.42² =
  29. 29.48² =
  30. 30.36² =
  31. 31.37² =
  32. 32.99² =
  33. 33.76² =
  34. 34.44² =
  35. 35.43² =
  36. 36.64² =
  37. 37.84² =
  38. 38.93² =
  39. 39.51² =
  40. 40.32² =

Answer key

  1. 2916
  2. 6241
  3. 961
  4. 7225
  5. 5329
  6. 8464
  7. 2401
  8. 3721
  9. 7569
  10. 1681
  11. 9604
  12. 3249
  13. 4225
  14. 1225
  15. 6724
  16. 8836
  17. 3481
  18. 5929
  19. 1444
  20. 2809
  21. 2025
  22. 1089
  23. 9409
  24. 8281
  25. 2209
  26. 1521
  27. 5476
  28. 1764
  29. 2304
  30. 1296
  31. 1369
  32. 9801
  33. 5776
  34. 1936
  35. 1849
  36. 4096
  37. 7056
  38. 8649
  39. 2601
  40. 1024

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