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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 304 · 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. 1.59² =
  2. 2.74² =
  3. 3.66² =
  4. 4.71² =
  5. 5.81² =
  6. 6.69² =
  7. 7.88² =
  8. 8.97² =
  9. 9.31² =
  10. 10.42² =
  11. 11.91² =
  12. 12.99² =
  13. 13.52² =
  14. 14.47² =
  15. 15.41² =
  16. 16.55² =
  17. 17.75² =
  18. 18.83² =
  19. 19.38² =
  20. 20.39² =
  21. 21.87² =
  22. 22.96² =
  23. 23.35² =
  24. 24.34² =
  25. 25.92² =
  26. 26.58² =
  27. 27.93² =
  28. 28.77² =
  29. 29.63² =
  30. 30.85² =
  31. 31.76² =
  32. 32.94² =
  33. 33.37² =
  34. 34.62² =
  35. 35.45² =
  36. 36.61² =
  37. 37.84² =
  38. 38.67² =
  39. 39.53² =
  40. 40.36² =

Answer key

  1. 3481
  2. 5476
  3. 4356
  4. 5041
  5. 6561
  6. 4761
  7. 7744
  8. 9409
  9. 961
  10. 1764
  11. 8281
  12. 9801
  13. 2704
  14. 2209
  15. 1681
  16. 3025
  17. 5625
  18. 6889
  19. 1444
  20. 1521
  21. 7569
  22. 9216
  23. 1225
  24. 1156
  25. 8464
  26. 3364
  27. 8649
  28. 5929
  29. 3969
  30. 7225
  31. 5776
  32. 8836
  33. 1369
  34. 3844
  35. 2025
  36. 3721
  37. 7056
  38. 4489
  39. 2809
  40. 1296

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