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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 928 · 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. 1.51² =
  2. 2.77² =
  3. 3.57² =
  4. 4.48² =
  5. 5.34² =
  6. 6.36² =
  7. 7.64² =
  8. 8.93² =
  9. 9.37² =
  10. 10.61² =
  11. 11.91² =
  12. 12.95² =
  13. 13.56² =
  14. 14.83² =
  15. 15.78² =
  16. 16.39² =
  17. 17.47² =
  18. 18.71² =
  19. 19.31² =
  20. 20.43² =
  21. 21.81² =
  22. 22.38² =
  23. 23.41² =
  24. 24.32² =
  25. 25.97² =
  26. 26.96² =
  27. 27.65² =
  28. 28.59² =
  29. 29.86² =
  30. 30.85² =
  31. 31.54² =
  32. 32.42² =
  33. 33.88² =
  34. 34.82² =
  35. 35.49² =
  36. 36.45² =
  37. 37.62² =
  38. 38.92² =
  39. 39.89² =
  40. 40.84² =

Answer key

  1. 2601
  2. 5929
  3. 3249
  4. 2304
  5. 1156
  6. 1296
  7. 4096
  8. 8649
  9. 1369
  10. 3721
  11. 8281
  12. 9025
  13. 3136
  14. 6889
  15. 6084
  16. 1521
  17. 2209
  18. 5041
  19. 961
  20. 1849
  21. 6561
  22. 1444
  23. 1681
  24. 1024
  25. 9409
  26. 9216
  27. 4225
  28. 3481
  29. 7396
  30. 7225
  31. 2916
  32. 1764
  33. 7744
  34. 6724
  35. 2401
  36. 2025
  37. 3844
  38. 8464
  39. 7921
  40. 7056

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