Add and Subtract Decimals

Front

What is a decimal?

Back

A decimal is a number that includes a decimal point, which separates the whole number part from the fractional part. For example, in 3.14, 3 is the whole number and 14 is the fractional part.

Front

How do you add decimals?

Back

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

Front

How do you subtract decimals?

Back

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

Front

What is the result of 7.2 - 4.3?

Back

2.9

Front

What is the result of 8.4 - 3.03?

Back

5.37

Front

What is the result of 4.2 + 7.98?

Back

12.18

Front

What is the result of 3.3 + 2.22?

Back

5.52

Front

What is the importance of aligning decimal points when adding or subtracting?

Back

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

Front

What is a common mistake when adding or subtracting decimals?

Back

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

Front

How can you check your work after adding or subtracting decimals?

Back

You can check your work by estimating the answer and comparing it to your calculated result.