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 (.) to separate 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 value of 94 - 4.8?

Back

89.2

Front

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

Back

$11.27

Front

What is the sum of 7.9 and 18.72?

Back

26.62

Front

Find the difference: 123.6 - 0.08.

Back

123.52

Front

A computer programmer has two files totaling 93 gigabytes. If one file is 50.30 gigabytes, how big is the second file?

Back

42.70

Front

What is the first step in solving a multi-step decimal problem?

Back

Identify all the operations needed and the order in which to perform them.

Front

What does it mean to 'align' decimals?

Back

Aligning decimals means to line up the decimal points of the numbers being added or subtracted to ensure accurate calculations.