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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 621 · 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. 1.49² =
  2. 2.54² =
  3. 3.96² =
  4. 4.91² =
  5. 5.41² =
  6. 6.35² =
  7. 7.97² =
  8. 8.42² =
  9. 9.48² =
  10. 10.38² =
  11. 11.59² =
  12. 12.62² =
  13. 13.51² =
  14. 14.67² =
  15. 15.75² =
  16. 16.74² =
  17. 17.55² =
  18. 18.36² =
  19. 19.88² =
  20. 20.79² =
  21. 21.64² =
  22. 22.99² =
  23. 23.83² =
  24. 24.61² =
  25. 25.73² =
  26. 26.72² =
  27. 27.69² =
  28. 28.47² =
  29. 29.68² =
  30. 30.92² =
  31. 31.76² =
  32. 32.32² =
  33. 33.33² =
  34. 34.93² =
  35. 35.94² =
  36. 36.57² =
  37. 37.85² =
  38. 38.39² =
  39. 39.63² =
  40. 40.95² =

Answer key

  1. 2401
  2. 2916
  3. 9216
  4. 8281
  5. 1681
  6. 1225
  7. 9409
  8. 1764
  9. 2304
  10. 1444
  11. 3481
  12. 3844
  13. 2601
  14. 4489
  15. 5625
  16. 5476
  17. 3025
  18. 1296
  19. 7744
  20. 6241
  21. 4096
  22. 9801
  23. 6889
  24. 3721
  25. 5329
  26. 5184
  27. 4761
  28. 2209
  29. 4624
  30. 8464
  31. 5776
  32. 1024
  33. 1089
  34. 8649
  35. 8836
  36. 3249
  37. 7225
  38. 1521
  39. 3969
  40. 9025

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