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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 270 · 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. 1.73² =
  2. 2.39² =
  3. 3.43² =
  4. 4.41² =
  5. 5.65² =
  6. 6.89² =
  7. 7.47² =
  8. 8.87² =
  9. 9.62² =
  10. 10.37² =
  11. 11.84² =
  12. 12.56² =
  13. 13.53² =
  14. 14.75² =
  15. 15.76² =
  16. 16.78² =
  17. 17.72² =
  18. 18.59² =
  19. 19.38² =
  20. 20.63² =
  21. 21.51² =
  22. 22.82² =
  23. 23.44² =
  24. 24.97² =
  25. 25.57² =
  26. 26.83² =
  27. 27.34² =
  28. 28.96² =
  29. 29.95² =
  30. 30.55² =
  31. 31.31² =
  32. 32.67² =
  33. 33.92² =
  34. 34.32² =
  35. 35.85² =
  36. 36.88² =
  37. 37.36² =
  38. 38.49² =
  39. 39.68² =
  40. 40.64² =

Answer key

  1. 5329
  2. 1521
  3. 1849
  4. 1681
  5. 4225
  6. 7921
  7. 2209
  8. 7569
  9. 3844
  10. 1369
  11. 7056
  12. 3136
  13. 2809
  14. 5625
  15. 5776
  16. 6084
  17. 5184
  18. 3481
  19. 1444
  20. 3969
  21. 2601
  22. 6724
  23. 1936
  24. 9409
  25. 3249
  26. 6889
  27. 1156
  28. 9216
  29. 9025
  30. 3025
  31. 961
  32. 4489
  33. 8464
  34. 1024
  35. 7225
  36. 7744
  37. 1296
  38. 2401
  39. 4624
  40. 4096

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