Question

The binary number expression of the decimal number $31$ is

• A. $1111$
• B. $10111$
• C. $11011$
• D. $11111$

Answer 1

The correct option is D $11111$

$\underset{–}{2|31}$

$\underset{–}{2|15-1}$

$\underset{–}{2|7-1}$

$\underset{–}{2|3-1}$

$\underset{–}{2|1-1}$

$\underset{–}{2|0-1}$

Take upward arrow, write all $31\left(base10\right)=11111\left(base2\right)$