Question

Change an explain how to change 3/4 into a decimal?

Answer 1

divide 3 by 4 and you get 0.75

Answer 2

You'll want to set up a proportion out of 100. The answer you get is going to give you the two decimal places to the right of the decimal point, since the "hundredths" place is two places to the right of the decimal point:
\[\frac{ 3 }{4 }=\frac{ x }{ 100 }\]