If you know how to add and subtract whole numbers, then you can add and subtract decimals! Just be sure to line up the terms so that all the decimal points are in a vertical line.

                 

Click the buttons to learn how it's done.

                        

 

To add decimal numbers:

1. Put the numbers in a vertical column aligning the decimal points.
2. Add each column of digits, starting on the right and working left. If the sum of a column is more than 10, "carry" digits to the next column on the left.
3. Place the decimal point in the answer directly below the decimal points in the terms.

To subtract decimal numbers:

1. Put the numbers in a vertical column aligning the decimal points.
2. Subtract each column, starting on the right and working left. If the top number is smaller than the bottom number, borrow from the top number at the left.
3. Place the decimal point in the answer directly below the decimal points in the terms.
4. Check the answer by adding.