What is 28 in binary system?

Answer 1

1,2,4,8,16,32
28 divided by 16 is 1.
In the fifth place put a one.
12 is left over.
Divide 12 by 8 is 1.
In the fourth place is an 8.
four is left over.
Divide 4 by 4 it is 1.
In the third place is a 1 with nothing left over.
11100
1x16+
1x8+
1x4+
0x2+
0x1=28 in base ten.