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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 587 · 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. 1.71² =
  2. 2.56² =
  3. 3.61² =
  4. 4.41² =
  5. 5.57² =
  6. 6.49² =
  7. 7.62² =
  8. 8.79² =
  9. 9.76² =
  10. 10.36² =
  11. 11.91² =
  12. 12.75² =
  13. 13.74² =
  14. 14.35² =
  15. 15.88² =
  16. 16.37² =
  17. 17.83² =
  18. 18.38² =
  19. 19.77² =
  20. 20.47² =
  21. 21.51² =
  22. 22.46² =
  23. 23.94² =
  24. 24.85² =
  25. 25.81² =
  26. 26.32² =
  27. 27.42² =
  28. 28.87² =
  29. 29.65² =
  30. 30.64² =
  31. 31.99² =
  32. 32.82² =
  33. 33.69² =
  34. 34.93² =
  35. 35.39² =
  36. 36.33² =
  37. 37.48² =
  38. 38.31² =
  39. 39.89² =
  40. 40.34² =

Answer key

  1. 5041
  2. 3136
  3. 3721
  4. 1681
  5. 3249
  6. 2401
  7. 3844
  8. 6241
  9. 5776
  10. 1296
  11. 8281
  12. 5625
  13. 5476
  14. 1225
  15. 7744
  16. 1369
  17. 6889
  18. 1444
  19. 5929
  20. 2209
  21. 2601
  22. 2116
  23. 8836
  24. 7225
  25. 6561
  26. 1024
  27. 1764
  28. 7569
  29. 4225
  30. 4096
  31. 9801
  32. 6724
  33. 4761
  34. 8649
  35. 1521
  36. 1089
  37. 2304
  38. 961
  39. 7921
  40. 1156

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