In order to change 1 1/4 (One and One-Forth) to decimal form we need to convert it to a mixed fraction. 1 1/4 as a mixed fraction is 5/4.
We can now divide 5 by 4. We know that since 5 is larger than 4 so we are going to end up with a number greater than 1.
We can divide 5 by 4 with a calculator or do it longhand. In this video I did the division longhand (but checked my answer with a calculator). When we divide 5 by 4 we get 1.25.
So:
1 1/4 = 5/4 = 1.25
1.25 is greater than 1 so that is a good way to check if our answer is reasonable.
Note that 5/4 and 1.25 represent the same quantity, the are just written in different formats. 5/4 is a fraction and 1.25 is a number with a decimal.
