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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 338 · 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. 1.52² =
  2. 2.61² =
  3. 3.81² =
  4. 4.65² =
  5. 5.36² =
  6. 6.63² =
  7. 7.43² =
  8. 8.53² =
  9. 9.73² =
  10. 10.31² =
  11. 11.82² =
  12. 12.91² =
  13. 13.47² =
  14. 14.57² =
  15. 15.75² =
  16. 16.85² =
  17. 17.76² =
  18. 18.55² =
  19. 19.79² =
  20. 20.42² =
  21. 21.49² =
  22. 22.68² =
  23. 23.78² =
  24. 24.99² =
  25. 25.39² =
  26. 26.51² =
  27. 27.71² =
  28. 28.86² =
  29. 29.94² =
  30. 30.96² =
  31. 31.34² =
  32. 32.41² =
  33. 33.37² =
  34. 34.87² =
  35. 35.44² =
  36. 36.56² =
  37. 37.89² =
  38. 38.64² =
  39. 39.54² =
  40. 40.59² =

Answer key

  1. 2704
  2. 3721
  3. 6561
  4. 4225
  5. 1296
  6. 3969
  7. 1849
  8. 2809
  9. 5329
  10. 961
  11. 6724
  12. 8281
  13. 2209
  14. 3249
  15. 5625
  16. 7225
  17. 5776
  18. 3025
  19. 6241
  20. 1764
  21. 2401
  22. 4624
  23. 6084
  24. 9801
  25. 1521
  26. 2601
  27. 5041
  28. 7396
  29. 8836
  30. 9216
  31. 1156
  32. 1681
  33. 1369
  34. 7569
  35. 1936
  36. 3136
  37. 7921
  38. 4096
  39. 2916
  40. 3481

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