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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 828 · 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. 2.41² =
  3. 3.77² =
  4. 4.64² =
  5. 5.82² =
  6. 6.93² =
  7. 7.46² =
  8. 8.94² =
  9. 9.63² =
  10. 10.97² =
  11. 11.84² =
  12. 12.44² =
  13. 13.43² =
  14. 14.67² =
  15. 15.57² =
  16. 16.83² =
  17. 17.54² =
  18. 18.96² =
  19. 19.47² =
  20. 20.74² =
  21. 21.69² =
  22. 22.32² =
  23. 23.89² =
  24. 24.79² =
  25. 25.95² =
  26. 26.36² =
  27. 27.91² =
  28. 28.62² =
  29. 29.39² =
  30. 30.76² =
  31. 31.34² =
  32. 32.75² =
  33. 33.86² =
  34. 34.53² =
  35. 35.61² =
  36. 36.81² =
  37. 37.51² =
  38. 38.38² =
  39. 39.91² =
  40. 40.37² =

Answer key

  1. 1225
  2. 1681
  3. 5929
  4. 4096
  5. 6724
  6. 8649
  7. 2116
  8. 8836
  9. 3969
  10. 9409
  11. 7056
  12. 1936
  13. 1849
  14. 4489
  15. 3249
  16. 6889
  17. 2916
  18. 9216
  19. 2209
  20. 5476
  21. 4761
  22. 1024
  23. 7921
  24. 6241
  25. 9025
  26. 1296
  27. 8281
  28. 3844
  29. 1521
  30. 5776
  31. 1156
  32. 5625
  33. 7396
  34. 2809
  35. 3721
  36. 6561
  37. 2601
  38. 1444
  39. 8281
  40. 1369

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