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 80.93 and 68?

Back

12.93

Front

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

Back

31.9 hours

Front

What is the sum of 32.15 and 24.15?

Back

56.30

Front

What is the result of adding 55.78 and 4.6?

Back

60.38

Front

If a movie ticket costs $3.00, how much do Lia and James spend in total if they buy 2 tickets and additional snacks costing $20.50?

Back

$26.50

Front

What is the first step in adding decimals?

Back

Align the numbers by the decimal point.

Front

What should you do if the numbers have different lengths when adding or subtracting decimals?

Back

Add zeros to the end of the shorter number to make them the same length.