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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 961 · 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. 2.85² =
  3. 3.95² =
  4. 4.51² =
  5. 5.44² =
  6. 6.37² =
  7. 7.77² =
  8. 8.57² =
  9. 9.39² =
  10. 10.49² =
  11. 11.32² =
  12. 12.61² =
  13. 13.64² =
  14. 14.71² =
  15. 15.59² =
  16. 16.66² =
  17. 17.69² =
  18. 18.34² =
  19. 19.41² =
  20. 20.33² =
  21. 21.93² =
  22. 22.81² =
  23. 23.97² =
  24. 24.75² =
  25. 25.84² =
  26. 26.35² =
  27. 27.36² =
  28. 28.83² =
  29. 29.65² =
  30. 30.38² =
  31. 31.82² =
  32. 32.91² =
  33. 33.45² =
  34. 34.63² =
  35. 35.78² =
  36. 36.42² =
  37. 37.99² =
  38. 38.43² =
  39. 39.56² =
  40. 40.87² =

Answer key

  1. 5776
  2. 7225
  3. 9025
  4. 2601
  5. 1936
  6. 1369
  7. 5929
  8. 3249
  9. 1521
  10. 2401
  11. 1024
  12. 3721
  13. 4096
  14. 5041
  15. 3481
  16. 4356
  17. 4761
  18. 1156
  19. 1681
  20. 1089
  21. 8649
  22. 6561
  23. 9409
  24. 5625
  25. 7056
  26. 1225
  27. 1296
  28. 6889
  29. 4225
  30. 1444
  31. 6724
  32. 8281
  33. 2025
  34. 3969
  35. 6084
  36. 1764
  37. 9801
  38. 1849
  39. 3136
  40. 7569

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