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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 872 · 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. 2.35² =
  3. 3.34² =
  4. 4.82² =
  5. 5.51² =
  6. 6.87² =
  7. 7.53² =
  8. 8.92² =
  9. 9.84² =
  10. 10.61² =
  11. 11.63² =
  12. 12.96² =
  13. 13.36² =
  14. 14.31² =
  15. 15.39² =
  16. 16.81² =
  17. 17.79² =
  18. 18.94² =
  19. 19.49² =
  20. 20.43² =
  21. 21.59² =
  22. 22.75² =
  23. 23.32² =
  24. 24.74² =
  25. 25.98² =
  26. 26.66² =
  27. 27.88² =
  28. 28.76² =
  29. 29.57² =
  30. 30.33² =
  31. 31.58² =
  32. 32.93² =
  33. 33.77² =
  34. 34.48² =
  35. 35.64² =
  36. 36.99² =
  37. 37.42² =
  38. 38.95² =
  39. 39.68² =
  40. 40.54² =

Answer key

  1. 2025
  2. 1225
  3. 1156
  4. 6724
  5. 2601
  6. 7569
  7. 2809
  8. 8464
  9. 7056
  10. 3721
  11. 3969
  12. 9216
  13. 1296
  14. 961
  15. 1521
  16. 6561
  17. 6241
  18. 8836
  19. 2401
  20. 1849
  21. 3481
  22. 5625
  23. 1024
  24. 5476
  25. 9604
  26. 4356
  27. 7744
  28. 5776
  29. 3249
  30. 1089
  31. 3364
  32. 8649
  33. 5929
  34. 2304
  35. 4096
  36. 9801
  37. 1764
  38. 9025
  39. 4624
  40. 2916

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