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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 916 · 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. 1.87² =
  2. 2.51² =
  3. 3.83² =
  4. 4.81² =
  5. 5.74² =
  6. 6.45² =
  7. 7.71² =
  8. 8.75² =
  9. 9.99² =
  10. 10.52² =
  11. 11.42² =
  12. 12.91² =
  13. 13.65² =
  14. 14.36² =
  15. 15.55² =
  16. 16.68² =
  17. 17.46² =
  18. 18.43² =
  19. 19.38² =
  20. 20.77² =
  21. 21.47² =
  22. 22.84² =
  23. 23.89² =
  24. 24.61² =
  25. 25.35² =
  26. 26.34² =
  27. 27.62² =
  28. 28.73² =
  29. 29.58² =
  30. 30.41² =
  31. 31.57² =
  32. 32.69² =
  33. 33.66² =
  34. 34.37² =
  35. 35.86² =
  36. 36.33² =
  37. 37.93² =
  38. 38.49² =
  39. 39.88² =
  40. 40.79² =

Answer key

  1. 7569
  2. 2601
  3. 6889
  4. 6561
  5. 5476
  6. 2025
  7. 5041
  8. 5625
  9. 9801
  10. 2704
  11. 1764
  12. 8281
  13. 4225
  14. 1296
  15. 3025
  16. 4624
  17. 2116
  18. 1849
  19. 1444
  20. 5929
  21. 2209
  22. 7056
  23. 7921
  24. 3721
  25. 1225
  26. 1156
  27. 3844
  28. 5329
  29. 3364
  30. 1681
  31. 3249
  32. 4761
  33. 4356
  34. 1369
  35. 7396
  36. 1089
  37. 8649
  38. 2401
  39. 7744
  40. 6241

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