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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 Member1,245Registered User Senior Member15Registered User New Member104Registered 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.

1,245Registered 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