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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 72 · 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. 1.87² =
  2. 2.53² =
  3. 3.83² =
  4. 4.52² =
  5. 5.57² =
  6. 6.35² =
  7. 7.56² =
  8. 8.62² =
  9. 9.44² =
  10. 10.51² =
  11. 11.32² =
  12. 12.49² =
  13. 13.95² =
  14. 14.65² =
  15. 15.72² =
  16. 16.99² =
  17. 17.74² =
  18. 18.41² =
  19. 19.81² =
  20. 20.47² =
  21. 21.79² =
  22. 22.92² =
  23. 23.34² =
  24. 24.38² =
  25. 25.91² =
  26. 26.88² =
  27. 27.75² =
  28. 28.43² =
  29. 29.61² =
  30. 30.76² =
  31. 31.39² =
  32. 32.97² =
  33. 33.85² =
  34. 34.71² =
  35. 35.77² =
  36. 36.93² =
  37. 37.69² =
  38. 38.63² =
  39. 39.31² =
  40. 40.46² =

Answer key

  1. 7569
  2. 2809
  3. 6889
  4. 2704
  5. 3249
  6. 1225
  7. 3136
  8. 3844
  9. 1936
  10. 2601
  11. 1024
  12. 2401
  13. 9025
  14. 4225
  15. 5184
  16. 9801
  17. 5476
  18. 1681
  19. 6561
  20. 2209
  21. 6241
  22. 8464
  23. 1156
  24. 1444
  25. 8281
  26. 7744
  27. 5625
  28. 1849
  29. 3721
  30. 5776
  31. 1521
  32. 9409
  33. 7225
  34. 5041
  35. 5929
  36. 8649
  37. 4761
  38. 3969
  39. 961
  40. 2116

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