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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 911 · 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. 1.55² =
  2. 2.99² =
  3. 3.85² =
  4. 4.87² =
  5. 5.89² =
  6. 6.98² =
  7. 7.51² =
  8. 8.63² =
  9. 9.36² =
  10. 10.49² =
  11. 11.32² =
  12. 12.41² =
  13. 13.58² =
  14. 14.83² =
  15. 15.62² =
  16. 16.34² =
  17. 17.71² =
  18. 18.91² =
  19. 19.47² =
  20. 20.59² =
  21. 21.74² =
  22. 22.39² =
  23. 23.84² =
  24. 24.57² =
  25. 25.44² =
  26. 26.82² =
  27. 27.65² =
  28. 28.86² =
  29. 29.76² =
  30. 30.42² =
  31. 31.68² =
  32. 32.33² =
  33. 33.38² =
  34. 34.78² =
  35. 35.88² =
  36. 36.46² =
  37. 37.45² =
  38. 38.81² =
  39. 39.77² =
  40. 40.79² =

Answer key

  1. 3025
  2. 9801
  3. 7225
  4. 7569
  5. 7921
  6. 9604
  7. 2601
  8. 3969
  9. 1296
  10. 2401
  11. 1024
  12. 1681
  13. 3364
  14. 6889
  15. 3844
  16. 1156
  17. 5041
  18. 8281
  19. 2209
  20. 3481
  21. 5476
  22. 1521
  23. 7056
  24. 3249
  25. 1936
  26. 6724
  27. 4225
  28. 7396
  29. 5776
  30. 1764
  31. 4624
  32. 1089
  33. 1444
  34. 6084
  35. 7744
  36. 2116
  37. 2025
  38. 6561
  39. 5929
  40. 6241

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