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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 324 · 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. 1.81² =
  2. 2.59² =
  3. 3.57² =
  4. 4.48² =
  5. 5.41² =
  6. 6.49² =
  7. 7.37² =
  8. 8.45² =
  9. 9.54² =
  10. 10.51² =
  11. 11.46² =
  12. 12.61² =
  13. 13.42² =
  14. 14.71² =
  15. 15.91² =
  16. 16.84² =
  17. 17.43² =
  18. 18.34² =
  19. 19.69² =
  20. 20.63² =
  21. 21.44² =
  22. 22.55² =
  23. 23.92² =
  24. 24.31² =
  25. 25.99² =
  26. 26.35² =
  27. 27.74² =
  28. 28.64² =
  29. 29.85² =
  30. 30.83² =
  31. 31.89² =
  32. 32.32² =
  33. 33.33² =
  34. 34.56² =
  35. 35.86² =
  36. 36.68² =
  37. 37.96² =
  38. 38.94² =
  39. 39.97² =
  40. 40.62² =

Answer key

  1. 6561
  2. 3481
  3. 3249
  4. 2304
  5. 1681
  6. 2401
  7. 1369
  8. 2025
  9. 2916
  10. 2601
  11. 2116
  12. 3721
  13. 1764
  14. 5041
  15. 8281
  16. 7056
  17. 1849
  18. 1156
  19. 4761
  20. 3969
  21. 1936
  22. 3025
  23. 8464
  24. 961
  25. 9801
  26. 1225
  27. 5476
  28. 4096
  29. 7225
  30. 6889
  31. 7921
  32. 1024
  33. 1089
  34. 3136
  35. 7396
  36. 4624
  37. 9216
  38. 8836
  39. 9409
  40. 3844

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