Multiplying decimals
Download
1 / 17

Multiplying Decimals - PowerPoint PPT Presentation


  • 92 Views
  • Uploaded on

Multiplying Decimals. What happened to my line?!?!?!?!??!. Multiplying Fractions:. Is the product ALWAYS smaller than the fractions (factors)? Meaning, is this true for all fractions?. Multiplying Fractions:.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Multiplying Decimals' - neil


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Multiplying decimals

Multiplying Decimals

What happened to my line?!?!?!?!??!


Is the product always smaller than the fractions factors meaning is this true for all fractions

Multiplying Fractions:

Is the product ALWAYS smaller than the fractions (factors)? Meaning, is this true for all fractions?


Multiplying Fractions:

Is the product ALWAYS smaller than the fractions (factors)? Meaning, is this true for all fractions?It depends on the factors!



Do not line up the decimals
Do NOT line up the decimals!

The decimal places are growing and growing!


Why is this happening
Why is this happening?

  • We are multiplying hundredths times tenths:

  • So, the answer must be in thousandths!


Let s see that again
Let’s see that again:

hundredths

times

tenths =

thousandths!

The other multiplication stuff works like it always did.


If the factors fractions or decimals are less than 1 then the product will be smaller

Multiplying Fractions:

Multiplying Decimals:

If the factors (fractions OR decimals) are LESS than 1 then the product will be smaller!


Multiplying Fractions:

Multiplying Decimals:

If one of the factors (fractions OR decimals) is greater than 1 than the product will be bigger than one of the fractions/decimals? If BOTH are bigger than 1 than the product will be bigger!!


How do you know how many decimal places to put in the answer
How do you know how many decimal places to put in the answer?

  • Trick:

    • Count up the place values after the decimal point in the problem.

    • If there are 3 place values after the decimal points in the factors then your answer needs to be in the thousandths place…needs 3 decimal places.


0 07 0 2
0.07 • 0.2 answer?

23

  • 14

  • 1.4

  • 0.14

  • 0.014

  • 0.0014

  • 0.27

0


5 0 028
5 • 0.028 answer?

23

  • 14

  • 1.4

  • 0.14

  • 0.014

  • 0.0014

  • 0.27

0


4 8 3 25
4.8 • 3.25 answer?

Non-Response Grid


0 08 0 205
0.08 • 0.205 answer?

Non-Response Grid


Evaluate ab for a 1 06 and b 002
Evaluate answer?ab for a = 1.06 and b = .002

Non-Response Grid


Evaluate a b c for a 4 1 b 1 2 and c 03
Evaluate answer?a(b+ c) for a = 4.1, b = 1.2 and c = .03

Non-Response Grid


EXIT SLIP: answer?Text in your answer…Without multiplying…will 11.7 • 5 be closer to 55 or 60? Explain your reasoning.


ad