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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 571 · 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. 1.77² =
  2. 2.53² =
  3. 3.91² =
  4. 4.93² =
  5. 5.55² =
  6. 6.85² =
  7. 7.54² =
  8. 8.94² =
  9. 9.71² =
  10. 10.74² =
  11. 11.92² =
  12. 12.42² =
  13. 13.59² =
  14. 14.79² =
  15. 15.39² =
  16. 16.36² =
  17. 17.67² =
  18. 18.35² =
  19. 19.69² =
  20. 20.49² =
  21. 21.76² =
  22. 22.98² =
  23. 23.58² =
  24. 24.43² =
  25. 25.51² =
  26. 26.61² =
  27. 27.81² =
  28. 28.97² =
  29. 29.38² =
  30. 30.75² =
  31. 31.31² =
  32. 32.63² =
  33. 33.99² =
  34. 34.65² =
  35. 35.45² =
  36. 36.46² =
  37. 37.47² =
  38. 38.68² =
  39. 39.41² =
  40. 40.44² =

Answer key

  1. 5929
  2. 2809
  3. 8281
  4. 8649
  5. 3025
  6. 7225
  7. 2916
  8. 8836
  9. 5041
  10. 5476
  11. 8464
  12. 1764
  13. 3481
  14. 6241
  15. 1521
  16. 1296
  17. 4489
  18. 1225
  19. 4761
  20. 2401
  21. 5776
  22. 9604
  23. 3364
  24. 1849
  25. 2601
  26. 3721
  27. 6561
  28. 9409
  29. 1444
  30. 5625
  31. 961
  32. 3969
  33. 9801
  34. 4225
  35. 2025
  36. 2116
  37. 2209
  38. 4624
  39. 1681
  40. 1936

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