EASTFIST

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

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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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…)

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