121 Octal in Decimal

Let's convert the octal number 121 to decimal without using a calculator:

Step 1: Write Down Powers of 8

Write down the powers of 8 starting from the right, with the first digit corresponding to 80, the second to 81, the third to 82, and so on.

828180
6481
182818
Step 2: Convert Each Octal Digit to Decimal

Convert each octal digit to its decimal equivalent:

18 = 110

28 = 210

18 = 110

Step 3: Multiply and Sum

Multiply each octal digit by its corresponding power of 8 and sum the results.

(1 × 64) + (2 × 8) + (1 × 1) = 64 + 16 + 1 = 81

So, the decimal representation of the octal number 121 is 81.
Octal To Decimal Converter



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