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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 814 · 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. 2.51² =
  3. 3.84² =
  4. 4.62² =
  5. 5.63² =
  6. 6.71² =
  7. 7.79² =
  8. 8.45² =
  9. 9.36² =
  10. 10.78² =
  11. 11.96² =
  12. 12.43² =
  13. 13.82² =
  14. 14.91² =
  15. 15.49² =
  16. 16.56² =
  17. 17.77² =
  18. 18.55² =
  19. 19.88² =
  20. 20.81² =
  21. 21.47² =
  22. 22.44² =
  23. 23.69² =
  24. 24.58² =
  25. 25.46² =
  26. 26.61² =
  27. 27.37² =
  28. 28.64² =
  29. 29.38² =
  30. 30.33² =
  31. 31.32² =
  32. 32.31² =
  33. 33.42² =
  34. 34.99² =
  35. 35.59² =
  36. 36.35² =
  37. 37.76² =
  38. 38.41² =
  39. 39.65² =
  40. 40.86² =

Answer key

  1. 5329
  2. 2601
  3. 7056
  4. 3844
  5. 3969
  6. 5041
  7. 6241
  8. 2025
  9. 1296
  10. 6084
  11. 9216
  12. 1849
  13. 6724
  14. 8281
  15. 2401
  16. 3136
  17. 5929
  18. 3025
  19. 7744
  20. 6561
  21. 2209
  22. 1936
  23. 4761
  24. 3364
  25. 2116
  26. 3721
  27. 1369
  28. 4096
  29. 1444
  30. 1089
  31. 1024
  32. 961
  33. 1764
  34. 9801
  35. 3481
  36. 1225
  37. 5776
  38. 1681
  39. 4225
  40. 7396

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