More Practice: 49

So, starting with 2⁵:

Power of 2	Include?	Subtraction	Binary so Far
25 == 32	32 is less than 49	49 - 32 == 17	1 _ _ _ _ _
24 == 16	16 is less than 17	17 - 16 == 1	1 1 _ _ _ _
at this point you can jump to the end:
20 == 1	1 equals 1	1 - 1 == 0	1 1 0 0 0 1

So 49 represented in binary is 110001.