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11 terms

GRE Math Rules

STUDY
PLAY
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.
common square roots
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
distributive law
a(b+c)=ab+ac