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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 292 · 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. 1.61² =
  2. 2.41² =
  3. 3.88² =
  4. 4.54² =
  5. 5.74² =
  6. 6.79² =
  7. 7.67² =
  8. 8.81² =
  9. 9.68² =
  10. 10.94² =
  11. 11.36² =
  12. 12.86² =
  13. 13.49² =
  14. 14.97² =
  15. 15.78² =
  16. 16.57² =
  17. 17.77² =
  18. 18.39² =
  19. 19.72² =
  20. 20.64² =
  21. 21.51² =
  22. 22.35² =
  23. 23.69² =
  24. 24.31² =
  25. 25.92² =
  26. 26.63² =
  27. 27.47² =
  28. 28.75² =
  29. 29.76² =
  30. 30.87² =
  31. 31.42² =
  32. 32.73² =
  33. 33.89² =
  34. 34.37² =
  35. 35.45² =
  36. 36.59² =
  37. 37.38² =
  38. 38.66² =
  39. 39.32² =
  40. 40.62² =

Answer key

  1. 3721
  2. 1681
  3. 7744
  4. 2916
  5. 5476
  6. 6241
  7. 4489
  8. 6561
  9. 4624
  10. 8836
  11. 1296
  12. 7396
  13. 2401
  14. 9409
  15. 6084
  16. 3249
  17. 5929
  18. 1521
  19. 5184
  20. 4096
  21. 2601
  22. 1225
  23. 4761
  24. 961
  25. 8464
  26. 3969
  27. 2209
  28. 5625
  29. 5776
  30. 7569
  31. 1764
  32. 5329
  33. 7921
  34. 1369
  35. 2025
  36. 3481
  37. 1444
  38. 4356
  39. 1024
  40. 3844

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