Adding and Subtracting Decimals

Front

What is a decimal?

Back

A decimal is a fraction whose denominator is a power of ten, represented with a decimal point. For example, 0.5 is a decimal that represents 5/10.

Front

How do you add decimals?

Back

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.

Front

What is the result of 21 + 4.09?

Back

25.09

Front

How do you subtract decimals?

Back

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.

Front

What is the result of 94 - 4.8?

Back

89.2

Front

If Kelly has $20 and spends $2.15 and $6.58, how much does she have left?

Back

$11.27

Front

What is the result of 7.05 - 4.6?

Back

2.45

Front

What is the result of 2.496 - 1.672?

Back

0.824

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 sums or differences.