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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 844 · 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. 1.97² =
  2. 2.71² =
  3. 3.44² =
  4. 4.34² =
  5. 5.61² =
  6. 6.85² =
  7. 7.74² =
  8. 8.48² =
  9. 9.57² =
  10. 10.58² =
  11. 11.86² =
  12. 12.88² =
  13. 13.41² =
  14. 14.79² =
  15. 15.37² =
  16. 16.35² =
  17. 17.32² =
  18. 18.53² =
  19. 19.99² =
  20. 20.81² =
  21. 21.47² =
  22. 22.96² =
  23. 23.38² =
  24. 24.91² =
  25. 25.89² =
  26. 26.77² =
  27. 27.72² =
  28. 28.87² =
  29. 29.43² =
  30. 30.73² =
  31. 31.66² =
  32. 32.65² =
  33. 33.42² =
  34. 34.56² =
  35. 35.62² =
  36. 36.92² =
  37. 37.31² =
  38. 38.64² =
  39. 39.75² =
  40. 40.82² =

Answer key

  1. 9409
  2. 5041
  3. 1936
  4. 1156
  5. 3721
  6. 7225
  7. 5476
  8. 2304
  9. 3249
  10. 3364
  11. 7396
  12. 7744
  13. 1681
  14. 6241
  15. 1369
  16. 1225
  17. 1024
  18. 2809
  19. 9801
  20. 6561
  21. 2209
  22. 9216
  23. 1444
  24. 8281
  25. 7921
  26. 5929
  27. 5184
  28. 7569
  29. 1849
  30. 5329
  31. 4356
  32. 4225
  33. 1764
  34. 3136
  35. 3844
  36. 8464
  37. 961
  38. 4096
  39. 5625
  40. 6724

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