###### Math You Might Find Useful For Daily Problem Solving ### Order of operations

Parenthesis, Exponents/Power, Multiplication, Division/Modulus, Addition, Subtraction

Notation example
(a2 * b) + c – d
1. a2
2. * b
3. + c
4. – d

### Proportions

`a / A = x / X`

 a b — = — A B

You’re trying to solve x. You have to cross-multiply. Be mindful of order of operations.

``````x * A = a * X
x = a * X / A``````

Because I’m so nice, I coded up a very basic proportions calculator for you. Give it a try now!
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###### How to Calculate Total PayPal Payment Fee

If you’re doing monetary transactions through PayPal, you should be aware that PayPal takes a cut for their services. This is how you would calculate the actual amount to charge someone who owes you money. (more…)

###### Blame it on the algo-algo-algorithms: Basic Math Equations to use in 2D game development

3D game development gets into another dimension of complexity, literally. But sometimes simple is better. Let’s see some simple math equations and structures used in 2D game development. (more…)