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Ratios

Page history last edited by PBworks 13 years ago

 

                                                                      What is a ratio?

 

 

 

 

Rotating Arrow RightThe main function of a ratio is to compare or relate numbers.

 

They are sometimes in the form of Fractions.

 

For example, 2/3 is a ratio. So is 2:3 and 2 to 3.  They all mean the same thing.

 

The first number(2) is called the antecedent and the second number(3) is called the

 

consequent.

 

If you add both the antecedent and the consequent you get the total number.

 

The total number is 5 (2+3).

 

 

 

Rotating Arrow RightYou can check the ratios in decimals.

 

 

                      For example: 2/5 or 2 divided by 5=0.4

 

                      The antecedent divided by the total number is part of the total number.

 

                      3/5 or 3 divided by 5=0.6

 

                      The consequent divided by the total number is the other part of the number.

 

                      So if you add 0.4 and 0.6 it equals 1, the total number.

 

Rotating Arrow RightYou can also do it in percentages

 

                     For example:40% + 60% = 100%

                      

             

                     Another example is of this picture:     

 

 

 

                      1. In the top left circle, there is a ratios of 1 to 2 of red shaded parts to white parts of the circle.

 

                          The total number is 3 because the circle is split into 3 parts.(or 1+2)

 

                      2. In the top right circle, there is a ratio of 1 to 1 of red shaded spots to white parts of the circle.

 

                            The total number is 2 because the circle is split into 2 parts.(or 1+1)

 

                      3. In the bottom circle, there is a ratio of 3 to 3 of green shaded spots to white parts of the circle.

 

                         The total number is 6 because the circle is split into 6 parts. (or 3+3)

 

 

Rotating Arrow RightIf you are doing a problem,THE ORDER MATTERS.

 

                        For example: The ratio of boys to girls in a class is 13:15

 

                        The number of boys in the class would be 13 since it is the first word of the ratio

 

                        in the problem. The number of girls would be 15 since it the second word of the

 

                        ratio in the problem.

 

                        If they asked what is the ratio of boys to the class then you would have to add

 

                        the boys and the girls and make it equal 13:28(13+15)

 

Rotating Arrow RightIf you are doing a problem that asks "of the 13:28 boys in a class how

 

many are boys in TMS are there?" heres how:

 

 

                     In a problem like this,they usually include how many people there are in all.

 

                     If there are a total of 900 students at TMS, then you ask how do I only find 

 

                     how many boys there are only with these two numbers.  It is actually quite simple .

 

                     All you do is multiply 13:28 and 900. 

 

                     So 13/28(900)=417.85 boys but we cannot have .85 boys so we round up to 418.

 

                     The answer would be about 418 boys at TMS.

 

  arrow right   CLICK AT THE LINK(S) BELOW TO LEARN MORE ABOUT RATIOS:

 

http://www.purplemath.com/modules/ratio.htm

 

http://www.mathleague.com/help/ratio/ratio.htm

 

http://www.math.com/school/subject1/lessons/S1U2L1GL.html

 

Comments (25)

Anonymous said

at 12:25 pm on Oct 29, 2007

i think you need more colors its too black

Anonymous said

at 8:48 pm on Oct 29, 2007

don't listen to MinJun.
your doing fine.
Just add color to the title.

Alex L. said

at 6:22 pm on Oct 30, 2007

good job, keep up the good work.

Anonymous said

at 6:57 pm on Oct 30, 2007

hmmm...whys there a samwhich next to your name alex?

Anonymous said

at 7:42 pm on Oct 30, 2007

haha. a California Contributer.
Alex L. is a California Contributer

Anonymous said

at 11:00 pm on Oct 30, 2007

wow, you finally started making your page.

Anonymous said

at 5:07 pm on Oct 31, 2007

The lucky person to post the 10th comment gets 10$...jk jk...no really...

Anonymous said

at 3:47 pm on Nov 1, 2007

why is your title go into the second line?

Anonymous said

at 4:06 pm on Nov 1, 2007

no it doesnt......

Anonymous said

at 4:34 pm on Nov 1, 2007

not in the edit page.

Anonymous said

at 4:37 pm on Nov 1, 2007

y r u editing my page agin?

Anonymous said

at 4:44 pm on Nov 1, 2007

YESSSSSSSSS!!!!!!!!I hav da seventh most revisions out of all the pages!!!!!!

Anonymous said

at 6:10 pm on Nov 1, 2007

thanks :) nice page

Anonymous said

at 9:05 pm on Nov 1, 2007

wow. you must go on a lot.
you worked a lot on it...
wow.
nice :)

Anonymous said

at 6:38 pm on Nov 3, 2007

Aaron, geesh, why do yu comment ur self...
wut a loser...heheh...jk...
umm, i think yu should center ur title and put more colors into ur page...
so yeah...
i still love ur page tho....
its prolly better then mines...
hmmmm, yeah...

Anonymous said

at 10:05 am on Nov 5, 2007

so uh...nice page except your missing a word in the ORDER MATTERS section, but still, why would u go and comment yourself?

Anonymous said

at 1:07 pm on Nov 5, 2007

put some more
pictures on it.
&& examples
to make your page even better

Anonymous said

at 1:08 pm on Nov 5, 2007

very good job! nice colors and good explanations.

Anonymous said

at 1:18 pm on Nov 5, 2007

I really like this page, but maybe you could add some more pictures onto it. I really like how you organized it by blue words being titles, and black letters being informational text :]

Anonymous said

at 1:19 pm on Nov 5, 2007

Nice job. you just need more pictures.

Anonymous said

at 1:29 pm on Nov 5, 2007

great job but like michaellc said u need more pics or examples, and more links

Anonymous said

at 6:57 pm on Nov 6, 2007

YESsSSSsSssssss! 102 revisions!!! Whoo-ho0!

Anonymous said

at 9:15 pm on Nov 6, 2007

wOW aARON YOU DID A GOOD JOB
kEEP uP tHe gOOD WORK!!!!

Anonymous said

at 4:15 pm on Nov 7, 2007

wow aron nice page (ps STOP COMMENTING YOURSELF IT WEIR)

Anonymous said

at 6:56 pm on Nov 21, 2007

Very good. It would be easier to read if you fix the line breaks at the top of the page.

3.5 of 4 points
11 of 12 total project points

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