# 2015 1st Half in Review – Mathematics

Time flies indeed! Half of the year is over.

If you have observed, I have refrained from posting reviews every month. This is due to the fact that I am only posting 4-5 posts every month. The first half of the year have been so busy and I think the next half will even be busier.

Anyway, here are the mathematics content posts for the first half of the year. Enjoy!

**1st Half in Review – Mathematics**

1.) How to Use the Factorial Notation

2.) How to Use the Factorial Notation

3.) What exactly is the vertical line test?

4.) Why the Area of a Rhombus is Half the Product of its Diagonals

5.) Understanding the Concept of Inverse Functions

6.) Why the Multiplication by 11 Trick Works

7.) The difference between AND and OR

8.) Introduction to Negation and the NOT Operator

9.) Understanding the Basics of the De Morgan’s Laws

10.) Understanding If-Then Statements

11.) 4 Interesting Things about the Japanese Counting Systems

12.) On Equations of Intersecting, Coinciding, and Parallel Lines

13.) How to Represent Inequalities in One Variable

14.) A Closer Look at Coinciding Lines

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