# Study sets matching "gmat math knotes"

Dividing by 5

double and halving

squaring shortcuts

doubling an area of a square and how to…

1. if a number is divisible by 5 you can always multiply it by…

1. if you have 2 numbers that need to be multiplied and one is…

1. multiples of ten are easy. you just multiply the base unit…

Mupltiply the origional sum by 8 which is 2^3

Dividing by 5

1. if a number is divisible by 5 you can always multiply it by…

double and halving

1. if you have 2 numbers that need to be multiplied and one is…

Absolute Value

General rule about variables

0^x

1^x

-Generally have two solutions... -+/-... -isolate expression in brac…

if you need to solve for n variables you need n equations

0

1

Absolute Value

-Generally have two solutions... -+/-... -isolate expression in brac…

General rule about variables

if you need to solve for n variables you need n equations

Compound Interest

Area of a Triangle

Area of a circle

Find the original price if given the to…

Compound interest is interest calculated on the initial princi…

The area of a triangle is 1/2bh

The area of a circle is pi x radius squared

X= Original Price = 100%... New Price/X+Percentage= X... Example: T…

Compound Interest

Compound interest is interest calculated on the initial princi…

Area of a Triangle

The area of a triangle is 1/2bh

Integer... Positive Integer / Negative Int…

Sum of the angles of a triangle is?

a - b = - (b - a)

Multiples

is a number that can be written without a fractional component…

180

...

Multiple of 3 are 3 (=3

**1), 6 (=3**2), 9(=3**3), 12(=3**4), e…Integer... Positive Integer / Negative Int…

is a number that can be written without a fractional component…

Sum of the angles of a triangle is?

180

Area of a rectangle

Perimeter of a rectangle

7 ^1 (1st power equals)

7^b+1 (b+1 power equals)... plug in 1

A=lw (area = Lenth x Width)

l

**2 +w**2=p (add up all 4 sides)7^1 = 7

plug in 1... 7^1+1 = 7^2 = 49

Area of a rectangle

A=lw (area = Lenth x Width)

Perimeter of a rectangle

l

**2 +w**2=p (add up all 4 sides)Is there a rule for odd*odd?

Is there a rule for odd*even?

Is there a rule for even*even?

What's the formula for standard deviati…

Odd*odd=odd

Odd*even=even

Even*even=even

The square root of the average of (the difference between each…

Is there a rule for odd*odd?

Odd*odd=odd

Is there a rule for odd*even?

Odd*even=even