# GRE Math Rules

### 11 terms by Leon32

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### First 10 Prime numbers

2, 3, 5, 7, 11, 13, 17, 19, 23, 29
with 2 being the only even prime

### Multiplying fractions

multiply straight across

### dividing fractions

To divide fractions, invert the second one and multiply

### How to find the percent increase/decrease

Percent Change= Difference/Original x 100

### exponent rules

Adding an exponent to a fraction always results in a smaller number, a negative number raised to an even power becomes positive, but a negative number raised to an odd number remains negative

### square root

a number which when multiplied by itself gives the original number

### multiply and divide square roots

the same as any other number

### adding and subtracting square roots

you can not add or subtract square roots unless the roots are the same.

1= 1
2= 1.4
3= 1.7
4= 2

### associative law

When you are adding or multiplying a series of numbers, you can regroup he numbers in any way you would like

a(b+c)=ab+ac

Example:

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