Step -1: Convert all the given decimals into like decimals.
Among ).007,8.5 and 30.08,
0.007 has maximum decimal places, i.e. 3.
Write 8.5 and 30.08 also to three decimal places.
Step -2: Add them.
Now, simply add the three decimal numbers from right to left
and place a decimal point after three places from right.