The number 42 in binary is "00110100 00110010." The binary system only uses two numeric values to represent numbers and letters, 1 and 0. The binary system is used internally by almost all modern computers, mobile phones, tablets, video game consoles and other computer-based devices.
To convert between base-10 numbers such as 42 and binary, each numeral has to go through a special process. This process involves dividing the number by two, with the remainder becoming the right-most digit in the binary code. The result is divided again, and the remainder becomes the next right-most digit. This is repeated until the quotient is zero.