## Math Concepts You Will Find on the SAT

While the SAT provides a list of formulas at the beginning, you still need to know a few that are not given to you. Here is a list of math formulas and concepts you are likely to use on the SAT.

### Percentage and Percentage Change

To calculate the percentage, divide the part by the whole and multiply by 100: (Part/Whole)*100. For the percentage change, divide the difference by the original and multiply by 100: (Difference/Original)*100.

### Circle Proportionality

When asked what part of a circle a piece represents, remember these formulas: Slice/Area=Arc/Circumference=Measure of angle/360.

### Line Formulas

Know the standard, point-slope line formula (y=mx+b) and the equation for slope (y2-y1)/(x2-x1).

### Quadratic Entities

You should know the three most common quadratic factors:

### Triangle's Third Side Rule

Remember that the third, longest side (

c) of a triangle is always greater than the difference between the other two sides (

a and

b) and less than the sum. (

a-

b)<

c<(

a+

b)

### Proportion Ratios

Know how to solve proportion ratios. a1/b1=a2/b2 and a1*a2=b1*b2.

### Average/Mean

To determine the average, or mean, of a set of numbers, add them all up and divide by the amount of numbers there are. (Sum/Amount)

### Probability

To determine the chance of an event occurring, divide the desired possibilities by the total number of possibilities. (Desired/Total)

### Cube

The surface area of a cube with sides (

s) is 6

s^2.

### Distance

Finally, remember the formula for determining distance is rate times time.

d=

rt
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