Binary
When being introduced to binary numbers, it helps to go back and think about how base 10 or decimal numbers work. Consider the number 1101(10) (base 10). We identify this number as one-thousand, one-hundred, one because it has a 1 in the thousands place, a 1 in the hundreds place, and a 1 in the ones place. But since the places represent 8, 4, 2, and 1 in binary, instead of 1000, 100, 10, and 1, the value converted to decimal (base 10) would be 8 + 4 + 1 = 13(10).