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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 207 · 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. 1.47² =
  2. 2.35² =
  3. 3.45² =
  4. 4.96² =
  5. 5.43² =
  6. 6.36² =
  7. 7.81² =
  8. 8.44² =
  9. 9.86² =
  10. 10.65² =
  11. 11.62² =
  12. 12.71² =
  13. 13.61² =
  14. 14.85² =
  15. 15.95² =
  16. 16.57² =
  17. 17.56² =
  18. 18.83² =
  19. 19.64² =
  20. 20.92² =
  21. 21.99² =
  22. 22.75² =
  23. 23.84² =
  24. 24.37² =
  25. 25.58² =
  26. 26.74² =
  27. 27.98² =
  28. 28.41² =
  29. 29.39² =
  30. 30.68² =
  31. 31.52² =
  32. 32.34² =
  33. 33.73² =
  34. 34.38² =
  35. 35.77² =
  36. 36.42² =
  37. 37.59² =
  38. 38.79² =
  39. 39.51² =
  40. 40.69² =

Answer key

  1. 2209
  2. 1225
  3. 2025
  4. 9216
  5. 1849
  6. 1296
  7. 6561
  8. 1936
  9. 7396
  10. 4225
  11. 3844
  12. 5041
  13. 3721
  14. 7225
  15. 9025
  16. 3249
  17. 3136
  18. 6889
  19. 4096
  20. 8464
  21. 9801
  22. 5625
  23. 7056
  24. 1369
  25. 3364
  26. 5476
  27. 9604
  28. 1681
  29. 1521
  30. 4624
  31. 2704
  32. 1156
  33. 5329
  34. 1444
  35. 5929
  36. 1764
  37. 3481
  38. 6241
  39. 2601
  40. 4761

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