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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 939 · 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. 1.79² =
  2. 2.98² =
  3. 3.74² =
  4. 4.71² =
  5. 5.91² =
  6. 6.82² =
  7. 7.76² =
  8. 8.35² =
  9. 9.56² =
  10. 10.38² =
  11. 11.33² =
  12. 12.36² =
  13. 13.63² =
  14. 14.64² =
  15. 15.47² =
  16. 16.93² =
  17. 17.34² =
  18. 18.43² =
  19. 19.95² =
  20. 20.75² =
  21. 21.77² =
  22. 22.86² =
  23. 23.85² =
  24. 24.84² =
  25. 25.92² =
  26. 26.51² =
  27. 27.58² =
  28. 28.65² =
  29. 29.49² =
  30. 30.99² =
  31. 31.42² =
  32. 32.41² =
  33. 33.39² =
  34. 34.59² =
  35. 35.57² =
  36. 36.73² =
  37. 37.37² =
  38. 38.87² =
  39. 39.61² =
  40. 40.96² =

Answer key

  1. 6241
  2. 9604
  3. 5476
  4. 5041
  5. 8281
  6. 6724
  7. 5776
  8. 1225
  9. 3136
  10. 1444
  11. 1089
  12. 1296
  13. 3969
  14. 4096
  15. 2209
  16. 8649
  17. 1156
  18. 1849
  19. 9025
  20. 5625
  21. 5929
  22. 7396
  23. 7225
  24. 7056
  25. 8464
  26. 2601
  27. 3364
  28. 4225
  29. 2401
  30. 9801
  31. 1764
  32. 1681
  33. 1521
  34. 3481
  35. 3249
  36. 5329
  37. 1369
  38. 7569
  39. 3721
  40. 9216

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