DEC 25 / OCT 31 / BIN 11,001 / HEX 19

DEC designates "decimal," or base 10, which is what we are used to:

(2 x 10) + (5 x 1) = 25

OCT designates "octal," or base 8, which works like this:

(3 x 8) + (1 x 1) = 25

BIN designates "binary," or base 2, which works like this:

(1 x 16) + (1 x 8) + (0 x 4) + (0 x 2) + (1 x 1) = 25

HEX designates "hexadecimal," or base 16, which works like this:

(1 x 16) + (9 x 1) = 25

contributed by Steve Barber

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