Answer
Move the decimal one place to the right to make 5.1 a whole number. Move the decimal one place to the right in 10.5 to avoid changing the quotient.
$5.\underrightarrow1\bigr)\overline{10.\underrightarrow5}$
Work Step by Step
$10.5\div5.1$=
$(10.5\times10)\div(5.1\times10)$=
$105\div51$
