Question 270031
Keep dividing by {{{2}}}, then read the remainders backwards
starting with the final division
{{{19/2 = 9}}} and {{{1}}} remainder
{{{9/2 = 4}}} and {{{1}}} remainder
{{{4/2 = 2}}} and {{{0}}} remainder
{{{2/2 = 1}}} and {{{0}}} remainder
(Most significant bit){{{10011}}}(Least significant bit)
 base 2  = {{{19}}} base 10
check:
The values of the positions starting with smallest are:
{{{2^0}}}
{{{2^1}}}
{{{2^2}}}
{{{2^3}}}
{{{2^4}}}
etc., and to read the base-2 number:
{{{2^0*1 + 2^1*1 + 2^2*0 + 2^3*0 + 2^4*1}}}
{{{1 + 2 + 0 + 0 + 16 = 19}}}
Here's some binary numbers:
0000 zero
0001 1
0010 2
0011 3
0100 4
0101 5
0110 6
0111 7
1000 8
Convert {{{8}}} to binary:
{{{8/2 = 4}}} +0
{{{4/2 = 2}}} +0
{{{2/2 = 1}}} +0
Reading it backwards:
{{{1000}}}base 2 = 8 base 10
You can now do the rest of the problems