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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 468 · 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. 1.84² =
  2. 2.51² =
  3. 3.49² =
  4. 4.87² =
  5. 5.48² =
  6. 6.58² =
  7. 7.33² =
  8. 8.52² =
  9. 9.38² =
  10. 10.93² =
  11. 11.63² =
  12. 12.91² =
  13. 13.66² =
  14. 14.71² =
  15. 15.94² =
  16. 16.88² =
  17. 17.35² =
  18. 18.53² =
  19. 19.41² =
  20. 20.83² =
  21. 21.96² =
  22. 22.99² =
  23. 23.32² =
  24. 24.31² =
  25. 25.98² =
  26. 26.42² =
  27. 27.68² =
  28. 28.92² =
  29. 29.77² =
  30. 30.34² =
  31. 31.56² =
  32. 32.43² =
  33. 33.76² =
  34. 34.81² =
  35. 35.54² =
  36. 36.46² =
  37. 37.57² =
  38. 38.74² =
  39. 39.64² =
  40. 40.59² =

Answer key

  1. 7056
  2. 2601
  3. 2401
  4. 7569
  5. 2304
  6. 3364
  7. 1089
  8. 2704
  9. 1444
  10. 8649
  11. 3969
  12. 8281
  13. 4356
  14. 5041
  15. 8836
  16. 7744
  17. 1225
  18. 2809
  19. 1681
  20. 6889
  21. 9216
  22. 9801
  23. 1024
  24. 961
  25. 9604
  26. 1764
  27. 4624
  28. 8464
  29. 5929
  30. 1156
  31. 3136
  32. 1849
  33. 5776
  34. 6561
  35. 2916
  36. 2116
  37. 3249
  38. 5476
  39. 4096
  40. 3481

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