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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 761 · 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. 1.73² =
  2. 2.59² =
  3. 3.43² =
  4. 4.46² =
  5. 5.38² =
  6. 6.41² =
  7. 7.31² =
  8. 8.45² =
  9. 9.53² =
  10. 10.68² =
  11. 11.54² =
  12. 12.51² =
  13. 13.83² =
  14. 14.71² =
  15. 15.91² =
  16. 16.34² =
  17. 17.79² =
  18. 18.49² =
  19. 19.78² =
  20. 20.81² =
  21. 21.98² =
  22. 22.36² =
  23. 23.58² =
  24. 24.62² =
  25. 25.75² =
  26. 26.69² =
  27. 27.95² =
  28. 28.96² =
  29. 29.57² =
  30. 30.32² =
  31. 31.97² =
  32. 32.84² =
  33. 33.35² =
  34. 34.44² =
  35. 35.37² =
  36. 36.99² =
  37. 37.61² =
  38. 38.56² =
  39. 39.65² =
  40. 40.87² =

Answer key

  1. 5329
  2. 3481
  3. 1849
  4. 2116
  5. 1444
  6. 1681
  7. 961
  8. 2025
  9. 2809
  10. 4624
  11. 2916
  12. 2601
  13. 6889
  14. 5041
  15. 8281
  16. 1156
  17. 6241
  18. 2401
  19. 6084
  20. 6561
  21. 9604
  22. 1296
  23. 3364
  24. 3844
  25. 5625
  26. 4761
  27. 9025
  28. 9216
  29. 3249
  30. 1024
  31. 9409
  32. 7056
  33. 1225
  34. 1936
  35. 1369
  36. 9801
  37. 3721
  38. 3136
  39. 4225
  40. 7569

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