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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 569 · 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. 1.82² =
  2. 2.64² =
  3. 3.79² =
  4. 4.51² =
  5. 5.53² =
  6. 6.41² =
  7. 7.99² =
  8. 8.89² =
  9. 9.91² =
  10. 10.44² =
  11. 11.52² =
  12. 12.71² =
  13. 13.58² =
  14. 14.81² =
  15. 15.35² =
  16. 16.73² =
  17. 17.31² =
  18. 18.42² =
  19. 19.94² =
  20. 20.32² =
  21. 21.62² =
  22. 22.98² =
  23. 23.37² =
  24. 24.56² =
  25. 25.92² =
  26. 26.61² =
  27. 27.83² =
  28. 28.36² =
  29. 29.43² =
  30. 30.46² =
  31. 31.38² =
  32. 32.84² =
  33. 33.86² =
  34. 34.85² =
  35. 35.45² =
  36. 36.95² =
  37. 37.78² =
  38. 38.88² =
  39. 39.63² =
  40. 40.65² =

Answer key

  1. 6724
  2. 4096
  3. 6241
  4. 2601
  5. 2809
  6. 1681
  7. 9801
  8. 7921
  9. 8281
  10. 1936
  11. 2704
  12. 5041
  13. 3364
  14. 6561
  15. 1225
  16. 5329
  17. 961
  18. 1764
  19. 8836
  20. 1024
  21. 3844
  22. 9604
  23. 1369
  24. 3136
  25. 8464
  26. 3721
  27. 6889
  28. 1296
  29. 1849
  30. 2116
  31. 1444
  32. 7056
  33. 7396
  34. 7225
  35. 2025
  36. 9025
  37. 6084
  38. 7744
  39. 3969
  40. 4225

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