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 the value of 0.5 + 0.25?

Back

0.5 + 0.25 = 0.75.

Front

What is the value of 3.75 - 1.25?

Back

3.75 - 1.25 = 2.50.

Front

How do you round a decimal to the nearest tenth?

Back

To round a decimal to the nearest tenth, look at the hundredths place. If it is 5 or greater, round up; if it is less than 5, round down.

Front

What is the value of 12.25 rounded to the nearest tenth?

Back

12.25 rounded to the nearest tenth is 12.3.

Front

What is the difference between 12.3 and 8.47?

Back

The difference is 12.3 - 8.47 = 3.83.

Front

If an item costs $2.50, how much do 3 items cost?

Back

3 items cost 3 x $2.50 = $7.50.

Front

What is the value of 0.75 + 0.5?

Back

0.75 + 0.5 = 1.25.