Adding and Subtracting Decimals Flashcard

Front

What is a decimal?

Back

A decimal is a fraction expressed in a special form, where the denominator is a power of ten. It is used to represent numbers that are not whole numbers.

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 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. Place the decimal point in the difference directly below the other decimal points.

Front

What is the sum of 2.5 and 3.25?

Back

5.75

Front

What is the result of 9.702 - 6.23?

Back

3.472

Front

What is the total cost if a boat costs $36,092.88, a trailer costs $3,295.76, and life jackets cost $450.36?

Back

$39,839.00

Front

If Pam had $135.62 and deposited $58.90, how much does she have now?

Back

$194.52

Front

What is the sum of 20.529 and 19.48?

Back

40.009

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.