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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 994 · 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. 1.81² =
  2. 2.38² =
  3. 3.43² =
  4. 4.61² =
  5. 5.76² =
  6. 6.65² =
  7. 7.46² =
  8. 8.86² =
  9. 9.57² =
  10. 10.33² =
  11. 11.53² =
  12. 12.68² =
  13. 13.56² =
  14. 14.34² =
  15. 15.89² =
  16. 16.36² =
  17. 17.98² =
  18. 18.41² =
  19. 19.49² =
  20. 20.83² =
  21. 21.62² =
  22. 22.85² =
  23. 23.51² =
  24. 24.97² =
  25. 25.94² =
  26. 26.32² =
  27. 27.45² =
  28. 28.47² =
  29. 29.96² =
  30. 30.48² =
  31. 31.84² =
  32. 32.35² =
  33. 33.44² =
  34. 34.39² =
  35. 35.71² =
  36. 36.92² =
  37. 37.73² =
  38. 38.72² =
  39. 39.69² =
  40. 40.31² =

Answer key

  1. 6561
  2. 1444
  3. 1849
  4. 3721
  5. 5776
  6. 4225
  7. 2116
  8. 7396
  9. 3249
  10. 1089
  11. 2809
  12. 4624
  13. 3136
  14. 1156
  15. 7921
  16. 1296
  17. 9604
  18. 1681
  19. 2401
  20. 6889
  21. 3844
  22. 7225
  23. 2601
  24. 9409
  25. 8836
  26. 1024
  27. 2025
  28. 2209
  29. 9216
  30. 2304
  31. 7056
  32. 1225
  33. 1936
  34. 1521
  35. 5041
  36. 8464
  37. 5329
  38. 5184
  39. 4761
  40. 961

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