Question

Not sure how to do this, Fill in the blank to make the two fractions equivalent. 3/5 = ?/25

Answer 1

if you write it as
\[ \frac{3}{5} = \frac{x}{25} \]

you can think of the problem as, what do I multiply the bottom number (the 5) by to get 25
then use that same number times 3 to get the "x"

or, (this is algebra), multiply both sides by 25 like this
\[ 25\cdot \frac{3}{5} = 25\cdot\frac{x}{25} \\
25\cdot \frac{3}{5} = x
\]