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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 957 · 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. 1.75² =
  2. 2.72² =
  3. 3.84² =
  4. 4.99² =
  5. 5.31² =
  6. 6.42² =
  7. 7.93² =
  8. 8.66² =
  9. 9.36² =
  10. 10.46² =
  11. 11.79² =
  12. 12.47² =
  13. 13.43² =
  14. 14.41² =
  15. 15.38² =
  16. 16.87² =
  17. 17.81² =
  18. 18.37² =
  19. 19.83² =
  20. 20.59² =
  21. 21.71² =
  22. 22.57² =
  23. 23.69² =
  24. 24.77² =
  25. 25.61² =
  26. 26.92² =
  27. 27.88² =
  28. 28.76² =
  29. 29.85² =
  30. 30.51² =
  31. 31.65² =
  32. 32.55² =
  33. 33.62² =
  34. 34.91² =
  35. 35.44² =
  36. 36.34² =
  37. 37.53² =
  38. 38.45² =
  39. 39.63² =
  40. 40.97² =

Answer key

  1. 5625
  2. 5184
  3. 7056
  4. 9801
  5. 961
  6. 1764
  7. 8649
  8. 4356
  9. 1296
  10. 2116
  11. 6241
  12. 2209
  13. 1849
  14. 1681
  15. 1444
  16. 7569
  17. 6561
  18. 1369
  19. 6889
  20. 3481
  21. 5041
  22. 3249
  23. 4761
  24. 5929
  25. 3721
  26. 8464
  27. 7744
  28. 5776
  29. 7225
  30. 2601
  31. 4225
  32. 3025
  33. 3844
  34. 8281
  35. 1936
  36. 1156
  37. 2809
  38. 2025
  39. 3969
  40. 9409

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