First Algebra Blog!!!

Welcome to my very first Algebra blog! Definitely exciting for me, because not only am I a blogger for the first time, but I am doing what I love while reaching more people!

Did you start taking an Algebra class? Did your child just start? Whether you or your child just started or have been an Algebra student for a while you have reached the right place!

I will start the blogs in chronological order of how Algebra is traditionally taught. Please browse to the blog entry that pertains where you are having difficulty or want more practice.  If you are a newbie to Algebra, start here and work your way down.

If you do not see the topic of interested please go to my forum and submit a question 🙂

-Mary

Variables and Expressions…an Introduction

Just a very quick overview of algebraic expressions.  MUCH more to come once we start word problems 🙂

 

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Evaluating Expressions

No matter which technical subject you study down the line (physics, chemistry, biology, etc) you will need to understand how to evaluate expressions!

Parentheses ( )

Brackets  [  ]

DO ANY OPERATION INSIDE PARENTHESES OR BRACKETS FIRST!

Example:  8 + [5*2] = 8 + [10] = 18

 
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Real Numbers, Sets, etc

Many of you have exposure to this prior to Algebra class but just in case here is a refresher. . .

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Points, Lines and Planes

Please check out my first video blog 🙂

Segment Addition Postulate

Welcome to the word of postulates!

Also please see this interesting example

Can Algebra Be Used in the REAL World?!

Many times people say: “I don’t need to learn Algebra! When will I ever use it?!” Well yesterday I was at the local grocery market and saw an extremely good example based on the sour cream that was on sale. I entered a cookie competition so I needed roughly 48 ounces of sour cream and had two choices to choose from. Either I could get a few little tubs or one big tub. The little tub was 16 ounces whereas the big tub was exactly 48 ounces.

16 ounces

48 ounces

First question – How many little tubs of sour cream would I need in order to have 48 ounces of sour cream?

Let x = amount of tubs.
We know each small tub had 16ounces. Therefore, if we got one tub it would 16*1 = 16, if we got two it would be 16*2 = 32 etc. So how many tubs (x) do I need?
16*x =48
x= 48/16
x=3

Answer: We need to get 3 tubs!

Second question – Is it cheaper to get three tubs of sour cream or one big tub?

Well as we saw it said for the small tub of 16 ounces it was $1.99. Therefore since we need three tubs our total is:
3 *$1.99=$5.97

Remember for one big tub it was $6.99.

Answer: It is cheaper to get three small tubs than one big tub!

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Another way of doing this is by looking at the price per ounce. I do not know if many stores have the price per ounce (the number in the yellow bubble on the bottom far right corner) but this is handy way to quickly see the value of what you are getting very quickly

Third question – How is price per ounce calculated?

For the 16 ounce tub we know that the price was $1.99. So how much did every ounce cost?
1.99/16=12.5 cents per ounce
(Notice that when it comes to owing money everything seems to always round up)

For the 48 ounce tub we know that the price was $6.99. So how much is every ounce cost?
6.99/48= 14.6 cents per ounce

Answer: Price per ounce = Total Cost / how many ounces.

As you can see that was a quick way to see that no matter how many tubs we bought, buying the little ones would be cheaper. One interesting side point, my sister sent me back to the store roughly 4 hours later and every single little tub of sour cream was sold!!

Wala that was Algebra!!!! Please keep this in mind when you go to places like Costco because you would be amazed – sometimes it really isn’t that great of a deal ☺