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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 871 · 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. 1.44² =
  2. 2.75² =
  3. 3.81² =
  4. 4.96² =
  5. 5.87² =
  6. 6.64² =
  7. 7.63² =
  8. 8.76² =
  9. 9.42² =
  10. 10.31² =
  11. 11.71² =
  12. 12.58² =
  13. 13.78² =
  14. 14.38² =
  15. 15.32² =
  16. 16.91² =
  17. 17.36² =
  18. 18.51² =
  19. 19.33² =
  20. 20.94² =
  21. 21.74² =
  22. 22.49² =
  23. 23.82² =
  24. 24.56² =
  25. 25.83² =
  26. 26.67² =
  27. 27.85² =
  28. 28.54² =
  29. 29.39² =
  30. 30.65² =
  31. 31.61² =
  32. 32.99² =
  33. 33.68² =
  34. 34.43² =
  35. 35.35² =
  36. 36.88² =
  37. 37.46² =
  38. 38.72² =
  39. 39.34² =
  40. 40.45² =

Answer key

  1. 1936
  2. 5625
  3. 6561
  4. 9216
  5. 7569
  6. 4096
  7. 3969
  8. 5776
  9. 1764
  10. 961
  11. 5041
  12. 3364
  13. 6084
  14. 1444
  15. 1024
  16. 8281
  17. 1296
  18. 2601
  19. 1089
  20. 8836
  21. 5476
  22. 2401
  23. 6724
  24. 3136
  25. 6889
  26. 4489
  27. 7225
  28. 2916
  29. 1521
  30. 4225
  31. 3721
  32. 9801
  33. 4624
  34. 1849
  35. 1225
  36. 7744
  37. 2116
  38. 5184
  39. 1156
  40. 2025

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