3568 is decimal, so it needs to be converted to binary by continually dividing by 2:
3568
1784r0
892r0
446r0
223r0
111r1
55r1
27r1
13r1
6r1
3r0
1r1
Now we start at the last division, writing down the quotient then all the remainders up to the start:
110111110000
Reverse the process to convert back to decimal, doubling and adding on the next digit:
2*1+1=3; 2*3=6; 2*6+1=13: 2*13+1=27; 2*27+1=55; 2*55+1=111; 2*111+1=223:
2*223=446; 2*446=892; 2*892=1784; 2*1784=3568.