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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 321 · 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. 1.56² =
  2. 2.71² =
  3. 3.53² =
  4. 4.31² =
  5. 5.46² =
  6. 6.83² =
  7. 7.52² =
  8. 8.51² =
  9. 9.68² =
  10. 10.66² =
  11. 11.69² =
  12. 12.87² =
  13. 13.77² =
  14. 14.97² =
  15. 15.91² =
  16. 16.38² =
  17. 17.63² =
  18. 18.65² =
  19. 19.94² =
  20. 20.67² =
  21. 21.44² =
  22. 22.61² =
  23. 23.89² =
  24. 24.36² =
  25. 25.41² =
  26. 26.85² =
  27. 27.84² =
  28. 28.35² =
  29. 29.43² =
  30. 30.62² =
  31. 31.86² =
  32. 32.82² =
  33. 33.88² =
  34. 34.37² =
  35. 35.95² =
  36. 36.76² =
  37. 37.54² =
  38. 38.32² =
  39. 39.42² =
  40. 40.81² =

Answer key

  1. 3136
  2. 5041
  3. 2809
  4. 961
  5. 2116
  6. 6889
  7. 2704
  8. 2601
  9. 4624
  10. 4356
  11. 4761
  12. 7569
  13. 5929
  14. 9409
  15. 8281
  16. 1444
  17. 3969
  18. 4225
  19. 8836
  20. 4489
  21. 1936
  22. 3721
  23. 7921
  24. 1296
  25. 1681
  26. 7225
  27. 7056
  28. 1225
  29. 1849
  30. 3844
  31. 7396
  32. 6724
  33. 7744
  34. 1369
  35. 9025
  36. 5776
  37. 2916
  38. 1024
  39. 1764
  40. 6561

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