Adding and Subtracting Decimals

To add decimals, align the numbers by the decimal point and add each column starting from the right, carrying over if necessary.

To subtract decimals, align the numbers by the decimal point and subtract each column starting from the right, borrowing if necessary.

The sum of 1.70 and 4.65 is 6.35.

The result of 7.9 minus 3.47 is 4.43.

To find the total of multiple decimal numbers, add them together by aligning the decimal points and summing each column.

The sum of 3.35, 1.4, and 3.65 is 8.4.

The difference between 80.93 and 68 is 12.93.

Aligning decimal points ensures that each digit is in the correct place value, which is crucial for accurate calculations.

A common mistake is not aligning the decimal points, which can lead to incorrect sums.

You can check your work by reversing the operation (subtracting the sum from one of the addends) or by estimating the answer.