21 Hex in Octal

Converting a hexadecimal number to octal without a calculator involves first converting the hexadecimal number to binary, then grouping the binary digits into groups of three, and finally converting each group to its octal equivalent. Here's a step-by-step guide for hexadecimal number21:

216 = 00102

116 = 00012

Group the binary digits into groups of three, starting from the right. If the last group has fewer than three digits, pad it with zeros on the left.

Binary: 00 100 001

With Zeros: 000 100 001

Convert each group of binary digits to its octal equivalent:

0002 = 08

1002 = 48

0012 = 18