Another way to convert decimal to binary is through subtraction. Recall when converting from binary to decimal, we added powers of 2 together. For instance, 1011 is 8 + 2 + 1. We can also perform the decimal to binary conversion by finding the largest power of 2 that can be subtracted from the decimal value and recording which power of 2 it was. We do this until we are left with a decimal value of 0. This first example, converting 89 to binary, comes from the textbook figure 3.5. To the right of this animation you will see powers of 2. We work our way down the list finding each power of 2 that we can subtract. For instance, with 89, we cannot subtract 256 or 128 from it, so we start with 64. After subtracting 64, we have 25. The next largest power of 2 that we can subtract is not 32, but is 16.