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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 981 · 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. 1.32² =
  2. 2.61² =
  3. 3.43² =
  4. 4.35² =
  5. 5.84² =
  6. 6.67² =
  7. 7.51² =
  8. 8.68² =
  9. 9.34² =
  10. 10.46² =
  11. 11.85² =
  12. 12.91² =
  13. 13.64² =
  14. 14.79² =
  15. 15.33² =
  16. 16.47² =
  17. 17.57² =
  18. 18.42² =
  19. 19.49² =
  20. 20.58² =
  21. 21.69² =
  22. 22.81² =
  23. 23.82² =
  24. 24.72² =
  25. 25.31² =
  26. 26.87² =
  27. 27.37² =
  28. 28.65² =
  29. 29.83² =
  30. 30.41² =
  31. 31.75² =
  32. 32.63² =
  33. 33.45² =
  34. 34.53² =
  35. 35.44² =
  36. 36.74² =
  37. 37.66² =
  38. 38.56² =
  39. 39.92² =
  40. 40.39² =

Answer key

  1. 1024
  2. 3721
  3. 1849
  4. 1225
  5. 7056
  6. 4489
  7. 2601
  8. 4624
  9. 1156
  10. 2116
  11. 7225
  12. 8281
  13. 4096
  14. 6241
  15. 1089
  16. 2209
  17. 3249
  18. 1764
  19. 2401
  20. 3364
  21. 4761
  22. 6561
  23. 6724
  24. 5184
  25. 961
  26. 7569
  27. 1369
  28. 4225
  29. 6889
  30. 1681
  31. 5625
  32. 3969
  33. 2025
  34. 2809
  35. 1936
  36. 5476
  37. 4356
  38. 3136
  39. 8464
  40. 1521

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