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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 432 · 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. 1.54² =
  2. 2.65² =
  3. 3.69² =
  4. 4.91² =
  5. 5.53² =
  6. 6.51² =
  7. 7.96² =
  8. 8.71² =
  9. 9.63² =
  10. 10.83² =
  11. 11.86² =
  12. 12.56² =
  13. 13.37² =
  14. 14.93² =
  15. 15.81² =
  16. 16.66² =
  17. 17.75² =
  18. 18.31² =
  19. 19.36² =
  20. 20.73² =
  21. 21.46² =
  22. 22.41² =
  23. 23.82² =
  24. 24.84² =
  25. 25.99² =
  26. 26.34² =
  27. 27.74² =
  28. 28.89² =
  29. 29.45² =
  30. 30.67² =
  31. 31.44² =
  32. 32.92² =
  33. 33.32² =
  34. 34.42² =
  35. 35.62² =
  36. 36.64² =
  37. 37.98² =
  38. 38.78² =
  39. 39.85² =
  40. 40.68² =

Answer key

  1. 2916
  2. 4225
  3. 4761
  4. 8281
  5. 2809
  6. 2601
  7. 9216
  8. 5041
  9. 3969
  10. 6889
  11. 7396
  12. 3136
  13. 1369
  14. 8649
  15. 6561
  16. 4356
  17. 5625
  18. 961
  19. 1296
  20. 5329
  21. 2116
  22. 1681
  23. 6724
  24. 7056
  25. 9801
  26. 1156
  27. 5476
  28. 7921
  29. 2025
  30. 4489
  31. 1936
  32. 8464
  33. 1024
  34. 1764
  35. 3844
  36. 4096
  37. 9604
  38. 6084
  39. 7225
  40. 4624

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