Adding and Subtracting 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, 3.14 is a decimal.

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 sum of 4.18 and 3.11?

Back

The sum of 4.18 and 3.11 is 7.29.

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 difference between 435.2 and 24.55?

Back

The difference is 410.65.

Front

What is the total of 10.9, 8.6, and 12.4?

Back

The total is 31.9.

Front

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

Back

Kelly has $11.27 left.

Front

What does it mean to round a decimal?

Back

Rounding a decimal means adjusting the number to a nearby value that is simpler or easier to work with, often to a certain number of decimal places.

Front

What is the value of 0.875 when rounded to the nearest hundredth?

Back

0.875 rounded to the nearest hundredth is 0.88.

Front

How do you compare two decimals?

Back

To compare two decimals, look at the digits from left to right, starting with the highest place value. The first digit that differs determines which decimal is larger.