Hexadecimal Number System

The hexadecimal number system, radix 16, consists of 16 symbol (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F)

hexadecimal

This is 2×256 + 14×16 +6×1 + 10× (1/16) + 3× (1/256)

(=742.63671 in Decimal)

How to Show that a Number is hexadecimal

The hexadecimal number follows with a little 16: A43₁₆

Binary Number System

The binary number system, radix two, it uses only two characters (1, 0). For many devices such as programmable controllers and digital computers, the binary system is the most useful. It was adopted for convenience

1×8 + 1×4 + 0×2 + 1 + 1×(1/2) + 0×(1/4) + 1×(1/8)
(=13.625 in Decimal)

How to Show that a Number is Binary
The binary number follows with a little 2: 10101₂ by this way people won't think it is the decimal number "10101" (ten thousand, one hundred and one).