Convert the decimal number 16 into binary and hexadecimal. Show all steps.

Divide the decimal number by 2 repeatedly until the quotient is 0, noting the remainder at each step.
$16 \div 2 = 8$ remainder 0
$8 \div 2 = 4$ remainder 0
$4 \div 2 = 2$ remainder 0
$2 \div 2 = 1$ remainder 0
$1 \div 2 = 0$ remainder 1

Read the remainders from bottom to top to get the binary equivalent.
The remainders are $1, 0, 0, 0, 0$.
So, $16_{10} = 10000_2$.

The binary representation of 16 is $\boxed{10000_2}$.

Divide the decimal number by 16 repeatedly until the quotient is 0, noting the remainder at each step.
$16 \div 16 = 1$ remainder 0
$1 \div 16 = 0$ remainder 1

Read the remainders from bottom to top to get the hexadecimal equivalent.
The remainders are $1, 0$.
So, $16_{10} = 10_{16}$.

The hexadecimal representation of 16 is $\boxed{10_{16}}$.