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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 626 · 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. 1.76² =
  2. 2.84² =
  3. 3.64² =
  4. 4.95² =
  5. 5.92² =
  6. 6.35² =
  7. 7.38² =
  8. 8.89² =
  9. 9.49² =
  10. 10.62² =
  11. 11.52² =
  12. 12.51² =
  13. 13.43² =
  14. 14.78² =
  15. 15.81² =
  16. 16.83² =
  17. 17.46² =
  18. 18.54² =
  19. 19.67² =
  20. 20.32² =
  21. 21.36² =
  22. 22.87² =
  23. 23.73² =
  24. 24.31² =
  25. 25.57² =
  26. 26.65² =
  27. 27.33² =
  28. 28.99² =
  29. 29.41² =
  30. 30.42² =
  31. 31.69² =
  32. 32.55² =
  33. 33.86² =
  34. 34.85² =
  35. 35.47² =
  36. 36.63² =
  37. 37.68² =
  38. 38.45² =
  39. 39.71² =
  40. 40.44² =

Answer key

  1. 5776
  2. 7056
  3. 4096
  4. 9025
  5. 8464
  6. 1225
  7. 1444
  8. 7921
  9. 2401
  10. 3844
  11. 2704
  12. 2601
  13. 1849
  14. 6084
  15. 6561
  16. 6889
  17. 2116
  18. 2916
  19. 4489
  20. 1024
  21. 1296
  22. 7569
  23. 5329
  24. 961
  25. 3249
  26. 4225
  27. 1089
  28. 9801
  29. 1681
  30. 1764
  31. 4761
  32. 3025
  33. 7396
  34. 7225
  35. 2209
  36. 3969
  37. 4624
  38. 2025
  39. 5041
  40. 1936

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