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, 3.5 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 3.35 and 1.4?

Back

4.75

Front

What is the sum of 55.78 and 4.6?

Back

60.38

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 21 + 4.09?

Back

25.09

Front

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

Back

31.9 hours

Front

What does the decimal 0.5 represent?

Back

0.5 represents one half, or 50%.

Front

What is the value of 3.49 + 4.60?

Back

8.09

Front

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

Back

To round a decimal, 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.