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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 355 · 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. 1.35² =
  2. 2.75² =
  3. 3.37² =
  4. 4.55² =
  5. 5.41² =
  6. 6.89² =
  7. 7.99² =
  8. 8.48² =
  9. 9.82² =
  10. 10.73² =
  11. 11.97² =
  12. 12.52² =
  13. 13.58² =
  14. 14.36² =
  15. 15.31² =
  16. 16.63² =
  17. 17.74² =
  18. 18.81² =
  19. 19.46² =
  20. 20.42² =
  21. 21.83² =
  22. 22.84² =
  23. 23.86² =
  24. 24.53² =
  25. 25.69² =
  26. 26.88² =
  27. 27.76² =
  28. 28.61² =
  29. 29.56² =
  30. 30.94² =
  31. 31.47² =
  32. 32.67² =
  33. 33.49² =
  34. 34.43² =
  35. 35.96² =
  36. 36.91² =
  37. 37.62² =
  38. 38.95² =
  39. 39.32² =
  40. 40.92² =

Answer key

  1. 1225
  2. 5625
  3. 1369
  4. 3025
  5. 1681
  6. 7921
  7. 9801
  8. 2304
  9. 6724
  10. 5329
  11. 9409
  12. 2704
  13. 3364
  14. 1296
  15. 961
  16. 3969
  17. 5476
  18. 6561
  19. 2116
  20. 1764
  21. 6889
  22. 7056
  23. 7396
  24. 2809
  25. 4761
  26. 7744
  27. 5776
  28. 3721
  29. 3136
  30. 8836
  31. 2209
  32. 4489
  33. 2401
  34. 1849
  35. 9216
  36. 8281
  37. 3844
  38. 9025
  39. 1024
  40. 8464

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