Add and Subtract 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 representation of the fraction 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

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 5.66 and 4.25?

Back

9.91

Front

What is the difference between 7.2 and 4.3?

Back

2.9

Front

Gunnar buys a notebook for $2.45, a package of pencils for $3.79, and an eraser for $1.55. How much did he spend in all?

Back

$7.79

Front

What is the result of 9.73 - 2.52?

Back

7.21

Front

What is 5.49 + 0.5?

Back

5.54

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 decimals?

Back

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