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**

Home
/
College Discussion / College Admissions and Search / SAT and ACT Tests & Test Preparation / SAT Preparation

College Confidential’s “Dean,” Sally Rubenstone, put together 25 of her best tips. Get your free copy of the "25 Tips from the Dean" eBook and get helpful advice on how to choose a college, get in, and pay for it: http://goo.gl/9zDJTM

Retro12
Posts: **6**Registered User 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

102Registered User Junior Member1,210Registered User Senior Member15Registered User New Member100Registered User Junior 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.

1,210Registered User Senior 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

42Registered User Junior Member629Registered User Member6Registered User New Member