how to convert decimal numbers to binary
on paper right out the powers of 2 from 2^1 to 2^8. or start at 1 and double the last number 8 times
then take the original decimal number and subtract the largest power of 2 that doesn't cause an answer less then zero
make a mark each time you are able to subtract a number till you get to zero
blank spaces = 0 marked spaces = 1
128 64 32 16 8 4 2 1
117
117 - 128 = X
117 - 64 = 53
53 - 32 = 21
21 - 16 = 5
5 - 8 = X
5 - 4 = 1
1 - 2 = X
1 - 1 = 0
so 117 =
|128| 64 | 32 | 16 | 8 | 4 | 2 | 1 |
| 0 |  1 | 1  | 1  | 0 | 1 | 0 | 1 |
01110101