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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 821 · 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. 1.92² =
  2. 2.97² =
  3. 3.95² =
  4. 4.42² =
  5. 5.59² =
  6. 6.41² =
  7. 7.65² =
  8. 8.71² =
  9. 9.94² =
  10. 10.33² =
  11. 11.63² =
  12. 12.53² =
  13. 13.43² =
  14. 14.44² =
  15. 15.72² =
  16. 16.81² =
  17. 17.74² =
  18. 18.88² =
  19. 19.47² =
  20. 20.87² =
  21. 21.83² =
  22. 22.75² =
  23. 23.49² =
  24. 24.58² =
  25. 25.91² =
  26. 26.57² =
  27. 27.46² =
  28. 28.37² =
  29. 29.66² =
  30. 30.35² =
  31. 31.76² =
  32. 32.54² =
  33. 33.62² =
  34. 34.56² =
  35. 35.96² =
  36. 36.86² =
  37. 37.68² =
  38. 38.48² =
  39. 39.93² =
  40. 40.51² =

Answer key

  1. 8464
  2. 9409
  3. 9025
  4. 1764
  5. 3481
  6. 1681
  7. 4225
  8. 5041
  9. 8836
  10. 1089
  11. 3969
  12. 2809
  13. 1849
  14. 1936
  15. 5184
  16. 6561
  17. 5476
  18. 7744
  19. 2209
  20. 7569
  21. 6889
  22. 5625
  23. 2401
  24. 3364
  25. 8281
  26. 3249
  27. 2116
  28. 1369
  29. 4356
  30. 1225
  31. 5776
  32. 2916
  33. 3844
  34. 3136
  35. 9216
  36. 7396
  37. 4624
  38. 2304
  39. 8649
  40. 2601

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