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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 945 · 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. 1.62² =
  2. 2.88² =
  3. 3.93² =
  4. 4.94² =
  5. 5.32² =
  6. 6.73² =
  7. 7.68² =
  8. 8.51² =
  9. 9.52² =
  10. 10.79² =
  11. 11.63² =
  12. 12.97² =
  13. 13.37² =
  14. 14.64² =
  15. 15.38² =
  16. 16.47² =
  17. 17.54² =
  18. 18.69² =
  19. 19.35² =
  20. 20.44² =
  21. 21.74² =
  22. 22.59² =
  23. 23.91² =
  24. 24.86² =
  25. 25.84² =
  26. 26.34² =
  27. 27.81² =
  28. 28.43² =
  29. 29.36² =
  30. 30.83² =
  31. 31.71² =
  32. 32.96² =
  33. 33.49² =
  34. 34.99² =
  35. 35.33² =
  36. 36.56² =
  37. 37.58² =
  38. 38.61² =
  39. 39.42² =
  40. 40.45² =

Answer key

  1. 3844
  2. 7744
  3. 8649
  4. 8836
  5. 1024
  6. 5329
  7. 4624
  8. 2601
  9. 2704
  10. 6241
  11. 3969
  12. 9409
  13. 1369
  14. 4096
  15. 1444
  16. 2209
  17. 2916
  18. 4761
  19. 1225
  20. 1936
  21. 5476
  22. 3481
  23. 8281
  24. 7396
  25. 7056
  26. 1156
  27. 6561
  28. 1849
  29. 1296
  30. 6889
  31. 5041
  32. 9216
  33. 2401
  34. 9801
  35. 1089
  36. 3136
  37. 3364
  38. 3721
  39. 1764
  40. 2025

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