Adding & 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 total cost is found by adding the prices of all items together.

Subtract the total cost of the item from the amount paid to find the change.

The difference is found by subtracting the smaller number from the larger number.

If the sum of a column exceeds 9, carry over the extra value to the next column to the left.

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

A common mistake is misaligning the decimal points, which can lead to incorrect sums or differences.

Multiply the dollar amount by 100 to convert it to cents.

Add the individual prices of each item to find the total cost.