Adding, Subtracting, Multiplying, and Dividing Decimals

Front

What is a decimal?

Back

A decimal is a fraction whose denominator is a power of ten, represented with a decimal point. For example, 0.5 is a decimal that represents 5/10.

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

How do you multiply decimals?

Back

To multiply decimals, multiply the numbers as if they were whole numbers, then count the total number of decimal places in both factors and place the decimal point in the product accordingly.

Front

How do you divide decimals?

Back

To divide decimals, move the decimal point in the divisor to the right until it is a whole number, then move the decimal point in the dividend the same number of places and divide as you would with whole numbers.

Front

What is the average?

Back

The average is the sum of a set of values divided by the number of values. For example, the average of 2, 3, and 4 is (2+3+4)/3 = 3.

Front

What is the formula for finding the total distance jogged?

Back

Total distance jogged = Distance per day × Number of days. For example, if Abbie jogged 4.8 miles each day for 22 days, the total distance is 4.8 × 22 = 105.6 miles.

Front

How do you find the difference between two decimal numbers?

Back

To find the difference, subtract the smaller number from the larger number. For example, to find how much more 1.25 is than 0.6, calculate 1.25 - 0.6 = 0.65.

Front

What is the length of each section if a banner is divided into equal parts?

Back

Length of each section = Total length of the banner ÷ Number of sections. For example, if a banner is 29.44 feet long and divided into 32 sections, each section is 29.44 ÷ 32 = 0.92 feet.

Front

What is the process of finding the average daily usage?

Back

To find the average daily usage, divide the total amount used by the number of days. For example, if Kim used 43.68 liters over 12 days, the average is 43.68 ÷ 12 = 3.64 liters.