a:4a=? a:\frac{4}{a}=\text{?} a:a4=?
Let's flip the fraction to get a multiplication exercise:
a×a4= a\times\frac{a}{4}= a×4a=
We'll add the a to the numerator of the fraction:
a×a4=a24 \frac{a\times a}{4}=\frac{a^2}{4} 4a×a=4a2
a24 \frac{a^2}{4} 4a2