Adding and Subtracting Decimals

A decimal is a fraction whose denominator is a power of ten, represented with a dot (decimal point) separating the whole number from the fractional part.

To add decimals, align the numbers by the decimal point and add as you would whole numbers, placing the decimal point in the sum directly below the other decimal points.

To subtract decimals, align the numbers by the decimal point and subtract as you would whole numbers, placing the decimal point in the difference directly below the other decimal points.

6.35

4.43

12.93

$26.50

8.28

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.