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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 831 · 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. 1.45² =
  2. 2.87² =
  3. 3.55² =
  4. 4.73² =
  5. 5.85² =
  6. 6.51² =
  7. 7.56² =
  8. 8.46² =
  9. 9.43² =
  10. 10.71² =
  11. 11.97² =
  12. 12.77² =
  13. 13.99² =
  14. 14.61² =
  15. 15.33² =
  16. 16.93² =
  17. 17.91² =
  18. 18.79² =
  19. 19.81² =
  20. 20.42² =
  21. 21.68² =
  22. 22.88² =
  23. 23.58² =
  24. 24.66² =
  25. 25.95² =
  26. 26.41² =
  27. 27.44² =
  28. 28.34² =
  29. 29.84² =
  30. 30.32² =
  31. 31.36² =
  32. 32.64² =
  33. 33.63² =
  34. 34.39² =
  35. 35.57² =
  36. 36.49² =
  37. 37.53² =
  38. 38.74² =
  39. 39.47² =
  40. 40.65² =

Answer key

  1. 2025
  2. 7569
  3. 3025
  4. 5329
  5. 7225
  6. 2601
  7. 3136
  8. 2116
  9. 1849
  10. 5041
  11. 9409
  12. 5929
  13. 9801
  14. 3721
  15. 1089
  16. 8649
  17. 8281
  18. 6241
  19. 6561
  20. 1764
  21. 4624
  22. 7744
  23. 3364
  24. 4356
  25. 9025
  26. 1681
  27. 1936
  28. 1156
  29. 7056
  30. 1024
  31. 1296
  32. 4096
  33. 3969
  34. 1521
  35. 3249
  36. 2401
  37. 2809
  38. 5476
  39. 2209
  40. 4225

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