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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 452 · 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. 1.62² =
  2. 2.55² =
  3. 3.41² =
  4. 4.71² =
  5. 5.72² =
  6. 6.51² =
  7. 7.31² =
  8. 8.58² =
  9. 9.85² =
  10. 10.66² =
  11. 11.54² =
  12. 12.78² =
  13. 13.77² =
  14. 14.74² =
  15. 15.73² =
  16. 16.96² =
  17. 17.68² =
  18. 18.75² =
  19. 19.53² =
  20. 20.89² =
  21. 21.52² =
  22. 22.83² =
  23. 23.48² =
  24. 24.49² =
  25. 25.38² =
  26. 26.36² =
  27. 27.56² =
  28. 28.32² =
  29. 29.57² =
  30. 30.92² =
  31. 31.93² =
  32. 32.91² =
  33. 33.88² =
  34. 34.44² =
  35. 35.87² =
  36. 36.35² =
  37. 37.98² =
  38. 38.99² =
  39. 39.61² =
  40. 40.43² =

Answer key

  1. 3844
  2. 3025
  3. 1681
  4. 5041
  5. 5184
  6. 2601
  7. 961
  8. 3364
  9. 7225
  10. 4356
  11. 2916
  12. 6084
  13. 5929
  14. 5476
  15. 5329
  16. 9216
  17. 4624
  18. 5625
  19. 2809
  20. 7921
  21. 2704
  22. 6889
  23. 2304
  24. 2401
  25. 1444
  26. 1296
  27. 3136
  28. 1024
  29. 3249
  30. 8464
  31. 8649
  32. 8281
  33. 7744
  34. 1936
  35. 7569
  36. 1225
  37. 9604
  38. 9801
  39. 3721
  40. 1849

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