Multiplying and Dividing Decimals

Multiplying and Dividing Decimals

by Mr. Royal

​Multiplying Decimals

• ​Multiply the numbers.

• ​How many numbers are there behind decimals TOTAL

• ​Place the decimal point in front of that many numbers on your answer

​Examples

• ​.12 * .01 = .0012

• ​.04 * .4 = .016

• ​.8 * .8 = .64

• ​.9 * .005 = .0045

​It's That Easy!

Multiple Choice

What is .04 * .7

• .028

• .28

• 2.8

• 28

Multiple Choice

Where does the decimal go in the answer?

001675

• .001675

• 0.01675

• 00.1675

• 001.675

​Dividing Decimals

​This one is a bit more difficult

• ​First set it up as a normal long division leaving the decimals where they are

• ​Now make the first number (the one not under the division roof) an integer by moving the decimal all the way to the right.

• ​How ever many times you moved the decimal point right on the first number, move it that many times to the right on the other number as well.

• ​Continue long division as normal, but maintaining the decimal points new place.

​Examples for dividing

​.24 / .8 = .3

​

​.50 / .05 = 10

​

​.897 / .09 = 9.966666666666

Multiple Choice

What is .081 / .09

• .009

• .09

• 0.9

• 9

Multiple Choice

.0085 / .05

• .0017

• .017

• .17

• 1.7

​How to Cheat

​If you don't feel like dividing... then multiply!

• ​Multiply your possible answers with the second number in the division problem. Whichever one results in the first number is the correct answer.