Negative Numbers

I see issues with negative numbers all the time, even from calculus students.
I think I can pinpoint three key things that really helped me understand negative numbers. Hopefully they will help you, too.

 

Here is a free online game to practice negative numbers:
http://www.mathsisfun.com/numbers/casey-runner.html

Fractions

In this lesson I will show you how to add, subtract, multiply, and divide fractions. Then I will show you how to simplify your answers.

Addition/Subtraction

These are done almost the same way. First, you find a common denominator (you need the same number on the bottom of both fractions). Then, you add or subtract across the top of the fractions and keep the bottom the same.

The hardest part of this is the common denominator. If you are good with numbers, you are trying to find the smallest number that both denominators can multiply to. If you are not good with numbers (don't know the times tables or need to use a calculator often), simply multiply the two bottom numbers. REMEMBER: whatever you do to the bottom you must also do to the top, and whatever you do to the top you must also do to the bottom.

I'll provide a few examples.