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Octal ○₈｜Definition｜1st｜20251119205401-00-⌔

Octal - Wikipedia

Octal

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Octal is a numeral system for representing a numeric value as base 8. Generally, an octal digit is represented as “0” to “7” with the same value as for decimal but with each place a power of 8. For example:

• ✤ ${112}_8=1\times 8^2+1\times 8^1+2\times 8^0$

In decimal, each place is a power of ten. For example:

• ✤ ${74}_{10}=7\times 10^1+4\times 10^0$

An octal digit can represent the value of a 3-digit binary number (starting from the right). For example, the binary representation for decimal 74 is 1001010. Two zeroes can be added at the left: (00)1 001 010, corresponding to the octal digits 1 1 2, yielding the octal representation 112.

Printed 2026-06-28.

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