118 ÷ 2 = 59 	0
59 ÷ 2 = 29 	1
29 ÷ 2 = 14 	1
14 ÷ 2 = 7 	0
7 ÷ 2 = 3 	1
3 ÷ 2 = 1 	1
1 ÷ 2 = 0 	1

for number 118 

but for 

53 

53/2 = 26  1
26/2 = 13  0
13/2 = 6   1
6/2  = 3   0
3/2  = 1   1
1/2  = 0   1
                   so its 101011  but thats wrong cause  thats 


                   (1x2^5) + (0x2^4) + (1x2^3) + (0x2^2) + (1x2^1) + (1x2^0)
but that equals to 32+8+2+1=43  so whats missing ??
my guess is that  if your demical number is an  odd number 2xk+1 you have to add 1 at 101011 ?