Sign Up For Free

**Join for FREE**,
and start talking with other members, weighing in on community polls,
and more.

Also, by registering and logging in you'll see fewer ads and pesky welcome messages (like this one!)

- Reply to threads, and start your own
- Create reports of your
**campus visits** - Share college
**photos**and**videos** **Find your dream college**, save your search and share with friends- Receive our
**monthly newsletter**

College Confidential’s “Dean,” Sally Rubenstone, put together 25 of her best tips. So far, the "25 Tips from the Dean" eBook has helped more than 10K students choose a college, get in, and pay for it. Get your free copy: http://goo.gl/9zDJTM

Retro12
Registered User Posts: **6** New Member

Where I can find useful math for formulas, like the one used for finding overlapping information, and finding the total distance of a round trip? Unfortunately, none of my SAT books has these.

Post edited by Retro12 on

## Replies to: SAT Math formulas

102Junior Member1,284Senior Member15New Member114Junior MemberDi = RT (or dirt) Distance = rate x time.

Overlapping formula is silly. Sure, it works, but it's just another formula to remember (and often remember wrong if you mess up just one part, leading to the wrong answer). Instead, I recommend drawing out Venn diagrams. It's so much easier to see and not get wrong that way.

1,284Senior MemberI frequently get asked about the key formulas that students really need to know. After 12 years of tutoring SAT math, I have created a small list of the most important formulas that students should memorize. Everything you need to know on this subject is below.

(1) Let's begin with the formulas that are given to you in the beginning of each math section. Memorize these. Here they are.

(picture ommitted)

(2) The following simple formula will make it very easy for you to solve problems involving Percent Change.

Percent Change = Change/Original * 100

Note that this formula works both for problems involving percent increase and problems involving percent decrease.

Let's look at a simple example:

Suppose that x increases from 8 to 9. By what percent does x increase?

Well, the Original value is 8, and the Change is 9 - 8 = 1. Therefore we have

Percent Change = 1/8

42Junior Member629Member6New Member