0.171=
Let's pay attention to where the decimal point is located in the number.
Remember:
One number after the decimal point represents tenths
Two numbers after the decimal point represent hundredths
Three numbers after the decimal point represent thousandths
And so on
In this case there are three numbers after the decimal point so the number is divided by 1000
Write the fraction in the following way:
We will remove the extra zeros and get: