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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 362 · 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. 1.31² =
  2. 2.53² =
  3. 3.91² =
  4. 4.65² =
  5. 5.78² =
  6. 6.95² =
  7. 7.41² =
  8. 8.56² =
  9. 9.36² =
  10. 10.49² =
  11. 11.69² =
  12. 12.72² =
  13. 13.73² =
  14. 14.86² =
  15. 15.67² =
  16. 16.66² =
  17. 17.99² =
  18. 18.51² =
  19. 19.54² =
  20. 20.87² =
  21. 21.61² =
  22. 22.43² =
  23. 23.45² =
  24. 24.32² =
  25. 25.96² =
  26. 26.76² =
  27. 27.52² =
  28. 28.79² =
  29. 29.97² =
  30. 30.81² =
  31. 31.57² =
  32. 32.75² =
  33. 33.83² =
  34. 34.38² =
  35. 35.77² =
  36. 36.42² =
  37. 37.68² =
  38. 38.92² =
  39. 39.98² =
  40. 40.33² =

Answer key

  1. 961
  2. 2809
  3. 8281
  4. 4225
  5. 6084
  6. 9025
  7. 1681
  8. 3136
  9. 1296
  10. 2401
  11. 4761
  12. 5184
  13. 5329
  14. 7396
  15. 4489
  16. 4356
  17. 9801
  18. 2601
  19. 2916
  20. 7569
  21. 3721
  22. 1849
  23. 2025
  24. 1024
  25. 9216
  26. 5776
  27. 2704
  28. 6241
  29. 9409
  30. 6561
  31. 3249
  32. 5625
  33. 6889
  34. 1444
  35. 5929
  36. 1764
  37. 4624
  38. 8464
  39. 9604
  40. 1089

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