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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 890 · 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. 1.41² =
  2. 2.53² =
  3. 3.51² =
  4. 4.61² =
  5. 5.95² =
  6. 6.84² =
  7. 7.81² =
  8. 8.63² =
  9. 9.66² =
  10. 10.45² =
  11. 11.69² =
  12. 12.52² =
  13. 13.72² =
  14. 14.62² =
  15. 15.76² =
  16. 16.77² =
  17. 17.58² =
  18. 18.46² =
  19. 19.38² =
  20. 20.31² =
  21. 21.35² =
  22. 22.79² =
  23. 23.32² =
  24. 24.93² =
  25. 25.64² =
  26. 26.36² =
  27. 27.39² =
  28. 28.87² =
  29. 29.91² =
  30. 30.42² =
  31. 31.34² =
  32. 32.33² =
  33. 33.59² =
  34. 34.55² =
  35. 35.96² =
  36. 36.68² =
  37. 37.65² =
  38. 38.49² =
  39. 39.86² =
  40. 40.47² =

Answer key

  1. 1681
  2. 2809
  3. 2601
  4. 3721
  5. 9025
  6. 7056
  7. 6561
  8. 3969
  9. 4356
  10. 2025
  11. 4761
  12. 2704
  13. 5184
  14. 3844
  15. 5776
  16. 5929
  17. 3364
  18. 2116
  19. 1444
  20. 961
  21. 1225
  22. 6241
  23. 1024
  24. 8649
  25. 4096
  26. 1296
  27. 1521
  28. 7569
  29. 8281
  30. 1764
  31. 1156
  32. 1089
  33. 3481
  34. 3025
  35. 9216
  36. 4624
  37. 4225
  38. 2401
  39. 7396
  40. 2209

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