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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 954 · 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. 1.73² =
  2. 2.36² =
  3. 3.62² =
  4. 4.37² =
  5. 5.39² =
  6. 6.35² =
  7. 7.68² =
  8. 8.51² =
  9. 9.65² =
  10. 10.67² =
  11. 11.33² =
  12. 12.77² =
  13. 13.74² =
  14. 14.58² =
  15. 15.44² =
  16. 16.49² =
  17. 17.95² =
  18. 18.89² =
  19. 19.91² =
  20. 20.85² =
  21. 21.61² =
  22. 22.41² =
  23. 23.31² =
  24. 24.45² =
  25. 25.93² =
  26. 26.32² =
  27. 27.48² =
  28. 28.97² =
  29. 29.55² =
  30. 30.52² =
  31. 31.43² =
  32. 32.72² =
  33. 33.81² =
  34. 34.53² =
  35. 35.42² =
  36. 36.96² =
  37. 37.57² =
  38. 38.63² =
  39. 39.59² =
  40. 40.84² =

Answer key

  1. 5329
  2. 1296
  3. 3844
  4. 1369
  5. 1521
  6. 1225
  7. 4624
  8. 2601
  9. 4225
  10. 4489
  11. 1089
  12. 5929
  13. 5476
  14. 3364
  15. 1936
  16. 2401
  17. 9025
  18. 7921
  19. 8281
  20. 7225
  21. 3721
  22. 1681
  23. 961
  24. 2025
  25. 8649
  26. 1024
  27. 2304
  28. 9409
  29. 3025
  30. 2704
  31. 1849
  32. 5184
  33. 6561
  34. 2809
  35. 1764
  36. 9216
  37. 3249
  38. 3969
  39. 3481
  40. 7056

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