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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 628 · 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. 1.58² =
  2. 2.83² =
  3. 3.91² =
  4. 4.82² =
  5. 5.71² =
  6. 6.39² =
  7. 7.41² =
  8. 8.78² =
  9. 9.74² =
  10. 10.46² =
  11. 11.61² =
  12. 12.64² =
  13. 13.69² =
  14. 14.51² =
  15. 15.62² =
  16. 16.32² =
  17. 17.84² =
  18. 18.54² =
  19. 19.43² =
  20. 20.47² =
  21. 21.56² =
  22. 22.94² =
  23. 23.72² =
  24. 24.81² =
  25. 25.35² =
  26. 26.87² =
  27. 27.53² =
  28. 28.42² =
  29. 29.31² =
  30. 30.96² =
  31. 31.77² =
  32. 32.76² =
  33. 33.68² =
  34. 34.88² =
  35. 35.45² =
  36. 36.73² =
  37. 37.36² =
  38. 38.85² =
  39. 39.65² =
  40. 40.44² =

Answer key

  1. 3364
  2. 6889
  3. 8281
  4. 6724
  5. 5041
  6. 1521
  7. 1681
  8. 6084
  9. 5476
  10. 2116
  11. 3721
  12. 4096
  13. 4761
  14. 2601
  15. 3844
  16. 1024
  17. 7056
  18. 2916
  19. 1849
  20. 2209
  21. 3136
  22. 8836
  23. 5184
  24. 6561
  25. 1225
  26. 7569
  27. 2809
  28. 1764
  29. 961
  30. 9216
  31. 5929
  32. 5776
  33. 4624
  34. 7744
  35. 2025
  36. 5329
  37. 1296
  38. 7225
  39. 4225
  40. 1936

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