Adding and Subtracting Decimals

Front

What is a decimal?

Back

A decimal is a fraction whose denominator is a power of ten, represented with a dot (decimal point) separating the whole number from the fractional part.

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 difference between 7.05 and 4.6?

Back

2.45

Front

What is the result of 9.43 minus 3.34?

Back

6.09

Front

What is the difference between 80.93 and 68?

Back

12.93

Front

If the Bell family drove for 10.9 hours, 8.6 hours, and 12.4 hours, what is the total time?

Back

31.9 hours

Front

What is 21 plus 4.09?

Back

25.09

Front

What is the first step in adding decimals?

Back

The first step is to align the numbers by the decimal point.

Front

What do you do if a decimal has fewer digits than another?

Back

You can add zeros to the right of the decimal to make the numbers have the same number of digits.