How to multiply and divide decimals

To convert a percentage into a decimal, divide the number by 100.

Instead of doing long division, simply pretend there is a decimal point at the end of the number, and then move the decimal point two places to the left.

You can think of 77 as 77.0 (or 77. - the zero doesn't matter). Now move the decimal point two places to the left.

Answer:

Examine the divisor 0.004. To make this a whole number, the decimal point needs to be moved three places right. Do this to both 0.004 and 320, adding an implied decimal point after the latter first:

Now perform this division:

The formula to calculate distance is where represents rate of speed and represents time.

In this problem, mph., and hours.

Convert the to an improper fraction:

To solve, multiply.

miles.

At its cruising speed of mph, the aircraft will travel miles in hours.

Divide:

Answer:

Divide the percentage by 100, or move the decimal point two places to the left:

Answer:

Set up the proportion statement, where is our answer, and solve:

To solve, divide:

Answer:

First, multiply the original price by the percentage:

Then, subtract that amount from the original price:

Answer: The magazine subscription currently costs \$38.25.

Divide .

Subtract that amount from to find the discount percentage Oliver received:

Answer: Oliver received a discount on the skateboard.

First, multiply, ignoring the decimal points:

Put a decimal point after the number:

Since there were five digits total (one per factor) left of the decimal points, move the decimal point in the product left five places, inserting zeroes as needed: