Answer
$0.35$
Work Step by Step
If we can write a fraction so that its denominator is one of 10,100, 1000,...,
we can easily write it as a decimal number
Using the fact that $20\cdot 5=100,$
$\displaystyle \frac{7}{20}=\frac{7\cdot 5}{20\cdot 5}=\frac{35}{100 }$
We write this as a decimal number with two digits after the decimal point:
$= 0.35$
