Helpful Base Conversion Property

What is 1 3 \dfrac{1}{3} expressed in the octal (base-8) system?

0. 22 0.\overline{22} 0. 41 0.\overline{41} 0. 25 0.\overline{25} 0. 18 0.\overline{18}

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1 solution

Drex Beckman
Jan 26, 2016

I decided to write this question since I haven't yet seen other number base questions dealing with decimal conversions. We may all know how to convert whole numbers, but the process is a little bit different when dealing with fractions. To start: 1 3 = 3 1 0 1 + 3 1 0 2 + 3 1 0 3 + . . . \frac{1}{3}=\frac{3}{10^{1}}+\frac{3}{10^{2}}+\frac{3}{10^{3}}+... . We represent a decimal in base-10 by fractions of powers of 10. So naturally, a decimal represented in base-8 (octal) should be represented by fractions of powers of 8: 1 3 = x 1 8 1 + x 2 8 2 + x 3 8 3 + . . . \frac{1}{3}=\frac{x_{1}}{8^{1}}+\frac{x_{2}}{8^{2}}+\frac{x_{3}}{8^{3}}+... . To solve we first multiply 1 3 \frac{1}{3} by 8: 8 3 \frac{8}{3} . We then change this improper fraction to a mixed number, giving us our first x n x_{n} : 8 3 = 2 2 3 ; x 1 = 2 \frac{8}{3}=2\frac{2}{3};\hspace{1mm}x_{1}=2 . We simply repeat this process to get closer: 2 3 8 = 5 1 3 \frac{2}{3}\cdot{8}=5\frac{1}{3} . If you look at the result of the second iteration of this algorithm, we get 1 3 \frac{1}{3} again, so we can be certain that this pattern of 252525 will continue on forever.

Great problem and great solution!

Arulx Z - 5 years, 4 months ago

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Thanks @Arulx Z !

Drex Beckman - 5 years, 4 months ago

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