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

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 rounding?

Back

Rounding is the process of adjusting the value of a number to make it simpler while keeping it close to the original value.

Front

How do you round a number to the nearest whole number?

Back

To round to the nearest whole number, look at the digit to the right of the decimal point. If it is 5 or greater, round up; if it is less than 5, round down.

Front

What is the value of 56.21 - 7.89?

Back

The value is 48.32.

Front

What is the cost of three items priced at $2.50 each?

Back

The total cost is $7.50.

Front

What is the difference between 12.3 pounds and 8.47 pounds?

Back

The difference is 3.83 pounds.

Front

How do you round 12.25 to the nearest tenth?

Back

12.25 rounded to the nearest tenth is 12.3.

Front

What is the first step in adding decimals?

Back

The first step is to align the decimal points of the numbers being added.