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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 899 · 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. 1.91² =
  2. 2.72² =
  3. 3.41² =
  4. 4.35² =
  5. 5.94² =
  6. 6.71² =
  7. 7.65² =
  8. 8.51² =
  9. 9.39² =
  10. 10.83² =
  11. 11.77² =
  12. 12.49² =
  13. 13.81² =
  14. 14.36² =
  15. 15.89² =
  16. 16.99² =
  17. 17.64² =
  18. 18.44² =
  19. 19.32² =
  20. 20.55² =
  21. 21.78² =
  22. 22.67² =
  23. 23.92² =
  24. 24.31² =
  25. 25.54² =
  26. 26.66² =
  27. 27.75² =
  28. 28.45² =
  29. 29.42² =
  30. 30.73² =
  31. 31.47² =
  32. 32.82² =
  33. 33.58² =
  34. 34.84² =
  35. 35.52² =
  36. 36.53² =
  37. 37.76² =
  38. 38.63² =
  39. 39.68² =
  40. 40.61² =

Answer key

  1. 8281
  2. 5184
  3. 1681
  4. 1225
  5. 8836
  6. 5041
  7. 4225
  8. 2601
  9. 1521
  10. 6889
  11. 5929
  12. 2401
  13. 6561
  14. 1296
  15. 7921
  16. 9801
  17. 4096
  18. 1936
  19. 1024
  20. 3025
  21. 6084
  22. 4489
  23. 8464
  24. 961
  25. 2916
  26. 4356
  27. 5625
  28. 2025
  29. 1764
  30. 5329
  31. 2209
  32. 6724
  33. 3364
  34. 7056
  35. 2704
  36. 2809
  37. 5776
  38. 3969
  39. 4624
  40. 3721

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