Domain and Range

         Two of the most reoccurring words in high-school math are Domain and Range. Honestly, it is a lot easier to figure these out than most math teachers let on. Putting it plain and simple, the 'Domain' is the 'x' term in a coordinate pair, and 'Range' is the 'y' term.

As an example:

(2,4)(3,3)(1,9)(8,7)

In the coordinate pairs above the domains and ranges are as follows:

Domain: (1, 2, 3, 8)
Range: (3, 4, 7, 9)

It is literally that easy!
Any questions? Comment!

Multiplication in Your Head: 2 Digits

Have you ever wanted to be able to do 2 digit multiplication in your head without a calculator? Well here is a quick and easy way:

24*16=?

20*10 = 200
20*6   = 120
10*4   =   40
6*4     =   24
               384

See how easy that is? Now you can blast through those multiplication problems!

Google Mathway

Today I stumbled upon a grand new tool. It is called Google Mathway, and can be found here. This is much like a super-calculator and can be used to solve thousands of problems from basic addition all the way to Differential Equations. This could be a very valuable tool and I highly suggest giving it a shot! There is even an option where you can see exactly how it solved the problem.

Technicalities of Lines, Rays, and Line Segments

Some algebra and geometry teachers can be real sticklers when it comes to these three models. There are slight differences between the three and I'm going to help you separate them.

A Line Segment  has two define endpoints, which is how it is labeled, and has no arrows as follows:

Line segment AB:



A Line is like a line segment, in which it is identified by two points. The line however continues on in both directions, so the ends are marked with arrows:

Line AB and Line GH:


A Ray is a nice healthy mix of the two. One end ends in a point, while the other has an arrow. A Ray also is identified by two points:

Ray AB:


Any Questions? Please, comment. I am more than willing to help you with anything you need. :)