Decimals are added and subtracted just like whole numbers. The decimal points play a vital role in the alignment of the digits. The digits with similar place value should be aligned. This is done by just aligning the decimal points.
Steps for Adding or Subtracting Decimals
Align the decimal points.
If the decimal number has less digits on the right side of the decimal point than the other numbers, put zero (0) at the end of the last digit until the number would have the same number of digits at the right side of the decimal point
Add or subtract the numbers in columns.
Insert the decimal point directly beneath the decimal points in the numbers being added or subtracted.