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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 834 · 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. 1.99² =
  2. 2.63² =
  3. 3.54² =
  4. 4.66² =
  5. 5.52² =
  6. 6.59² =
  7. 7.95² =
  8. 8.81² =
  9. 9.93² =
  10. 10.36² =
  11. 11.92² =
  12. 12.47² =
  13. 13.32² =
  14. 14.64² =
  15. 15.85² =
  16. 16.79² =
  17. 17.45² =
  18. 18.53² =
  19. 19.72² =
  20. 20.61² =
  21. 21.58² =
  22. 22.84² =
  23. 23.67² =
  24. 24.41² =
  25. 25.65² =
  26. 26.87² =
  27. 27.48² =
  28. 28.62² =
  29. 29.71² =
  30. 30.42² =
  31. 31.34² =
  32. 32.38² =
  33. 33.68² =
  34. 34.91² =
  35. 35.83² =
  36. 36.77² =
  37. 37.75² =
  38. 38.51² =
  39. 39.35² =
  40. 40.38² =

Answer key

  1. 9801
  2. 3969
  3. 2916
  4. 4356
  5. 2704
  6. 3481
  7. 9025
  8. 6561
  9. 8649
  10. 1296
  11. 8464
  12. 2209
  13. 1024
  14. 4096
  15. 7225
  16. 6241
  17. 2025
  18. 2809
  19. 5184
  20. 3721
  21. 3364
  22. 7056
  23. 4489
  24. 1681
  25. 4225
  26. 7569
  27. 2304
  28. 3844
  29. 5041
  30. 1764
  31. 1156
  32. 1444
  33. 4624
  34. 8281
  35. 6889
  36. 5929
  37. 5625
  38. 2601
  39. 1225
  40. 1444

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