Tuesday, July 12, 2016

Inequalities (Part 1)

Assalam'mualaikum and hi again bloggers and readers ! Next topic will be the inequalities. 

Inequality tells us about the relative size of two values.
Mathematics is not always about "equals"! Sometimes we only know that something is bigger or smaller. 

Example: Alex and Billy have a race, and Billy wins!

What do we know?
We don't know how fast they ran, but we do know that Billy was faster than Alex:
Billy was faster than Alex
We can write that down like this:
b > a
(Where "b" means how fast Billy was, ">" means "greater than", and "a" means how fast Alex was)
We call things like that inequalities (because they are not "equal")

Greater or Less Than

The two most common inequalities are:
Symbol
Words
Example Use
>
greater than
5 > 2
<
less than
7 < 9
They are easy to remember: the "small" end always points to the smaller number, like this:
greater than sign
Greater Than Symbol: BIG > small

Example: Alex plays in the under 15s soccer. How old is Alex?

We don't know exactly how old Alex is, because it doesn't say "equals"
But we do know "less than 15", so we can write:
Age < 15
The small end points to "Age" because the age is smaller than 15.

... Or Equal To!

We can also have inequalities that include "equals", like:
Symbol
Words
Example Use
greater than or equal to
x ≥ 1
less than or equal to
y ≤ 3

Example: you must be 13 or older to watch a movie.

The "inequality" is between your age and the age of 13.
Your age must be "greater than or equal to 13", which is written:
Age ≥ 13

Comparing Values

Practice >, < and = with Compare Numbers to 10
Learn more about Inequalities at Less Than or Greater Than

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