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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 443 · 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. 2.81² =
  3. 3.38² =
  4. 4.87² =
  5. 5.61² =
  6. 6.93² =
  7. 7.44² =
  8. 8.83² =
  9. 9.68² =
  10. 10.46² =
  11. 11.86² =
  12. 12.78² =
  13. 13.32² =
  14. 14.82² =
  15. 15.88² =
  16. 16.54² =
  17. 17.85² =
  18. 18.91² =
  19. 19.71² =
  20. 20.75² =
  21. 21.41² =
  22. 22.63² =
  23. 23.59² =
  24. 24.77² =
  25. 25.97² =
  26. 26.65² =
  27. 27.31² =
  28. 28.99² =
  29. 29.53² =
  30. 30.56² =
  31. 31.45² =
  32. 32.51² =
  33. 33.79² =
  34. 34.55² =
  35. 35.67² =
  36. 36.76² =
  37. 37.37² =
  38. 38.94² =
  39. 39.39² =
  40. 40.36² =

Answer key

  1. 3844
  2. 6561
  3. 1444
  4. 7569
  5. 3721
  6. 8649
  7. 1936
  8. 6889
  9. 4624
  10. 2116
  11. 7396
  12. 6084
  13. 1024
  14. 6724
  15. 7744
  16. 2916
  17. 7225
  18. 8281
  19. 5041
  20. 5625
  21. 1681
  22. 3969
  23. 3481
  24. 5929
  25. 9409
  26. 4225
  27. 961
  28. 9801
  29. 2809
  30. 3136
  31. 2025
  32. 2601
  33. 6241
  34. 3025
  35. 4489
  36. 5776
  37. 1369
  38. 8836
  39. 1521
  40. 1296

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