21 Decimal in Octal

Let's convert the decimal number 21 to octal without using a calculator:

Step 1: Divide by 8

Start by dividing 21 by 8:

21 ÷ 8 = 2 (Quotient) with a remainder of 5

Step 2: Final actions

The Quotient is less than 8 (2), so we will transfer it to the beginning of the number as a reminder.

Step 3: Write Remainders in Reverse Order

Now, write down the remainders from the last division to the first:

25

So, the octal representation of the decimal number 21 is 25.

Decimal To Octal Converter

Other examples of Decimal to Octal conversion