GRE_math

Question 1

odd*odd=

Answer 1

odd

Question 2

odd +/- odd =

Answer 2

even

Question 3

even*even =

Answer 3

even

Question 4

even +/- even =

Answer 4

even

Question 5

odd^odd

Answer 5

odd

Question 6

even^even

Answer 6

even

Question 7

even^odd

Answer 7

even

Question 8

(a+b)(a-b) = ?

Answer 8

a²-b²

Question 9

What’s x?

Answer 9

These are similar triangles, so use a proportion to solve

x/12 = 20/15

Question 10

Answer 10

Question 11

All inscribed triangles with a side that is a diameter of the circle are…

Answer 11

Right Triangles!

Question 12

Area of a parallelogram

Answer 12

A = B*H

Question 13

-(-4 < -x)

Answer 13

Reverse the inequality sign

4 > x

Question 14

if m > n, q( m> n) =…

Answer 14

qm > qn if q is positive

qm < qn if q is negative

qm = qn if q is zero

Question 15

Shortcut for figuring out which fraction is bigger:

7/16 vs. 3/7

Answer 15

Don’t find the common denominator, just find the numerator

Question 16

Shortcut

What’s 7/12 + 3/5?

Answer 16

Combine into one fraction. Cross multiply for numerator and multiply denominators.

((7x5) + (3x12))/12*5

Question 17

Shortcut

What’s 7/12 - 3/5?

Answer 17

Question 18

Shortcut

What’s 4/250 in decimal form?

Answer 18

Multiply by 4/4 to get 16/1000 = 0.016

Question 19

Name 8 right triangles

Answer 19

Question 20

What is c if:

200 = (a+b+c)/2

80 = (a+b)/3

Answer 20

Question 21

Answer 21

Question 22

What is the sum of the integers from 13 to 75, inclusive?

Answer 22

If it’s between x-y, use the formula y*(y+1)/2 - (x-1)*x/2

Question 23

How would you solve |x+4| > 6 ?

Answer 23

This is saying that whatever is inside of the absolute value symbol has to be more than 6 away from 0

So split this into: |x+4| > 6 AND |x+4| < -6 ?

Question 24

What’s the formula for compound interest?

Answer 24

P = principal amount (the initial amount you borrow or deposit)

r = annual rate of interest (as a decimal)

t = number of years the amount is deposited or borrowed for.

A = amount of money accumulated after n years, including interest.

n = number of times the interest is compounded per year

Question 25

How to remember rules for Distributive property

Answer 25

You can only distribute to something to one level below

House:

Attic = exponents & roots

Main Floor = multiplication & division

Basement = addition & subtraction

You can never distribute to a level above, the same level, or two levels below (exponents can’t be distributed to + & -)!