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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 891 · 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. 1.86² =
  2. 2.43² =
  3. 3.39² =
  4. 4.82² =
  5. 5.77² =
  6. 6.56² =
  7. 7.91² =
  8. 8.94² =
  9. 9.35² =
  10. 10.81² =
  11. 11.68² =
  12. 12.71² =
  13. 13.73² =
  14. 14.55² =
  15. 15.75² =
  16. 16.53² =
  17. 17.88² =
  18. 18.98² =
  19. 19.97² =
  20. 20.52² =
  21. 21.84² =
  22. 22.57² =
  23. 23.41² =
  24. 24.65² =
  25. 25.42² =
  26. 26.51² =
  27. 27.64² =
  28. 28.58² =
  29. 29.63² =
  30. 30.37² =
  31. 31.74² =
  32. 32.72² =
  33. 33.32² =
  34. 34.62² =
  35. 35.96² =
  36. 36.83² =
  37. 37.31² =
  38. 38.54² =
  39. 39.59² =
  40. 40.61² =

Answer key

  1. 7396
  2. 1849
  3. 1521
  4. 6724
  5. 5929
  6. 3136
  7. 8281
  8. 8836
  9. 1225
  10. 6561
  11. 4624
  12. 5041
  13. 5329
  14. 3025
  15. 5625
  16. 2809
  17. 7744
  18. 9604
  19. 9409
  20. 2704
  21. 7056
  22. 3249
  23. 1681
  24. 4225
  25. 1764
  26. 2601
  27. 4096
  28. 3364
  29. 3969
  30. 1369
  31. 5476
  32. 5184
  33. 1024
  34. 3844
  35. 9216
  36. 6889
  37. 961
  38. 2916
  39. 3481
  40. 3721

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