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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 999 · 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. 1.91² =
  2. 2.81² =
  3. 3.78² =
  4. 4.59² =
  5. 5.57² =
  6. 6.88² =
  7. 7.51² =
  8. 8.82² =
  9. 9.39² =
  10. 10.97² =
  11. 11.71² =
  12. 12.45² =
  13. 13.42² =
  14. 14.76² =
  15. 15.85² =
  16. 16.49² =
  17. 17.58² =
  18. 18.62² =
  19. 19.37² =
  20. 20.43² =
  21. 21.54² =
  22. 22.34² =
  23. 23.46² =
  24. 24.31² =
  25. 25.74² =
  26. 26.83² =
  27. 27.75² =
  28. 28.95² =
  29. 29.67² =
  30. 30.33² =
  31. 31.98² =
  32. 32.96² =
  33. 33.41² =
  34. 34.47² =
  35. 35.93² =
  36. 36.73² =
  37. 37.63² =
  38. 38.32² =
  39. 39.56² =
  40. 40.86² =

Answer key

  1. 8281
  2. 6561
  3. 6084
  4. 3481
  5. 3249
  6. 7744
  7. 2601
  8. 6724
  9. 1521
  10. 9409
  11. 5041
  12. 2025
  13. 1764
  14. 5776
  15. 7225
  16. 2401
  17. 3364
  18. 3844
  19. 1369
  20. 1849
  21. 2916
  22. 1156
  23. 2116
  24. 961
  25. 5476
  26. 6889
  27. 5625
  28. 9025
  29. 4489
  30. 1089
  31. 9604
  32. 9216
  33. 1681
  34. 2209
  35. 8649
  36. 5329
  37. 3969
  38. 1024
  39. 3136
  40. 7396

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