what are binary numbers
Binary numbers and arithmetic let you represent any amount you want using just two digits: 0 and 1. Here are some examples: Decimal 1 is binary 0001. Decimal 3 is binary 0011. Decimal 6 is binary 0110. Decimal 9 is binary 1001. Each digit 1 in a binary number represents a power of two, and each 0 represents zero: 0001 is 2 to the zero power, or 1. 0010 is 2 to the 1st power, or 2. 0100 is 2 to the 2nd power, or 4. 1000 is 2 to the 3rd power, or 8.