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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 924 · 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. 1.49² =
  2. 2.61² =
  3. 3.91² =
  4. 4.82² =
  5. 5.65² =
  6. 6.79² =
  7. 7.48² =
  8. 8.52² =
  9. 9.71² =
  10. 10.37² =
  11. 11.59² =
  12. 12.93² =
  13. 13.41² =
  14. 14.42² =
  15. 15.74² =
  16. 16.44² =
  17. 17.81² =
  18. 18.43² =
  19. 19.46² =
  20. 20.87² =
  21. 21.47² =
  22. 22.45² =
  23. 23.63² =
  24. 24.51² =
  25. 25.56² =
  26. 26.77² =
  27. 27.57² =
  28. 28.86² =
  29. 29.89² =
  30. 30.97² =
  31. 31.35² =
  32. 32.73² =
  33. 33.75² =
  34. 34.88² =
  35. 35.36² =
  36. 36.54² =
  37. 37.99² =
  38. 38.94² =
  39. 39.76² =
  40. 40.38² =

Answer key

  1. 2401
  2. 3721
  3. 8281
  4. 6724
  5. 4225
  6. 6241
  7. 2304
  8. 2704
  9. 5041
  10. 1369
  11. 3481
  12. 8649
  13. 1681
  14. 1764
  15. 5476
  16. 1936
  17. 6561
  18. 1849
  19. 2116
  20. 7569
  21. 2209
  22. 2025
  23. 3969
  24. 2601
  25. 3136
  26. 5929
  27. 3249
  28. 7396
  29. 7921
  30. 9409
  31. 1225
  32. 5329
  33. 5625
  34. 7744
  35. 1296
  36. 2916
  37. 9801
  38. 8836
  39. 5776
  40. 1444

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