# Study sets matching "gmat math knotes"

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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

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…

central angle

inscribed angle

sector

Tangent Meets Radius

an angle that touches the center of a circle

an angle that touches the perimeter of a circle

two radii plus an arch

Forms a right angle

central angle

an angle that touches the center of a circle

inscribed angle

an angle that touches the perimeter of a circle

Quadratic Formula

Simple Interest

Annual Compound Interest

Compound Interest

ax2 + bx + c = 0.

P

**r**t... P = starting principle; r = annual interest rate; t = nu…P(1+r)t... P = starting principle; r = annual interest rate; t =…

P(1 + r/x)xt ... P = starting principle; r = annual interest rate…

Quadratic Formula

ax2 + bx + c = 0.

Simple Interest

P

**r**t... P = starting principle; r = annual interest rate; t = nu…Multiplying Like Bases

Dividing Like Bases

Quotient to a Power

Product to a Power

Keep the base - add the exponents.

Keep the base - subtract the exponents.

"distribute" exponent to everything inside

"distribute" exponent to everything inside

Multiplying Like Bases

Keep the base - add the exponents.

Dividing Like Bases

Keep the base - subtract the exponents.

A number expressing the probability (p)…

A number expressing the probability (q)…

one important concept in problems with…

Two events are independent if occurrenc…

p=n/N

q=1-p = 1-n/N

When the first... marble is removed from a jar and not replaced,…

p = p1

**p2**...**pn-1**pnA number expressing the probability (p)…

p=n/N

A number expressing the probability (q)…

q=1-p = 1-n/N

Common Factors

Gross Profit

Combined Events

Multiplication Principle

Break down both numbers to their prime factors to see what fac…

Gross profit = Selling Price - Cost

For events E and F:... • not E = P(not E) = 1 - P(E)... • E or F = P…

The number of ways independent events can occur together can b…

Common Factors

Break down both numbers to their prime factors to see what fac…

Gross Profit

Gross profit = Selling Price - Cost