we are given
[tex]\frac{17}{40}[/tex]
we can use long division method
Firstly, we will try to make denominator either 10 , 100 , 1000 , 10000 form
and then we can put decimal accordingly
Here , we are given 40 in the denominator
[tex]40 \times 25=1000[/tex]
so, we will multiply both top and bottom by 25
[tex]\frac{17}{40}=\frac{25\times 17}{25\times 40}[/tex]
[tex]\frac{17}{40}=\frac{425}{1000}[/tex]
now, we can put decimal to three places because we have 1000 in bottom
so, we get
[tex]\frac{17}{40}=0.425[/tex]...............Answer