How do you convert 221 decimal into binary?

Answer 1

221

128 1 93

64 1 29

32 0 29

16 1 13

8 1 5

4 1 1

2 0 1

1 1 0

Column 1 = powers of 2 in descending order starting with the largest value that is not bigger than 221. Continue until you reach 20 = 1

Column 2 = 1 if the number in col 1 is not greater than the number in the row above, in col 3, else 0.

Column 3 = Previous entry in col 3 - col1*col2

Then, reading down column 2 gives the binary equivalent for 221.