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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 359 · 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. 1.33² =
  2. 2.91² =
  3. 3.66² =
  4. 4.53² =
  5. 5.35² =
  6. 6.74² =
  7. 7.92² =
  8. 8.46² =
  9. 9.68² =
  10. 10.44² =
  11. 11.71² =
  12. 12.56² =
  13. 13.41² =
  14. 14.34² =
  15. 15.62² =
  16. 16.52² =
  17. 17.98² =
  18. 18.87² =
  19. 19.37² =
  20. 20.58² =
  21. 21.38² =
  22. 22.77² =
  23. 23.73² =
  24. 24.75² =
  25. 25.95² =
  26. 26.96² =
  27. 27.63² =
  28. 28.57² =
  29. 29.93² =
  30. 30.31² =
  31. 31.61² =
  32. 32.43² =
  33. 33.49² =
  34. 34.48² =
  35. 35.32² =
  36. 36.45² =
  37. 37.47² =
  38. 38.81² =
  39. 39.55² =
  40. 40.69² =

Answer key

  1. 1089
  2. 8281
  3. 4356
  4. 2809
  5. 1225
  6. 5476
  7. 8464
  8. 2116
  9. 4624
  10. 1936
  11. 5041
  12. 3136
  13. 1681
  14. 1156
  15. 3844
  16. 2704
  17. 9604
  18. 7569
  19. 1369
  20. 3364
  21. 1444
  22. 5929
  23. 5329
  24. 5625
  25. 9025
  26. 9216
  27. 3969
  28. 3249
  29. 8649
  30. 961
  31. 3721
  32. 1849
  33. 2401
  34. 2304
  35. 1024
  36. 2025
  37. 2209
  38. 6561
  39. 3025
  40. 4761

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