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 dot (.) to separate the whole number from 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, placing the decimal point in the sum 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, placing the decimal point in the difference directly below the other decimal points.

Front

What is the sum of 32.15 and 24.15?

Back

56.30

Front

What is the difference between 123.6 and 0.08?

Back

123.52

Front

What is the sum of 2.98 and 5.3?

Back

8.28

Front

What is the difference between 9.73 and 2.52?

Back

7.21

Front

What is the sum of 87.03 and 90.9?

Back

177.93

Front

Why is it important to line up decimal points when adding or subtracting?

Back

Lining up decimal points ensures that each place value is correctly aligned, which is crucial for accurate calculations.

Front

What is a common mistake when adding decimals?

Back

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