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GRE Math Flash 1
Basic Math for the GRE General
| Question | Answer |
|---|---|
| percent formula | part = percent * whole |
| sum of consecutive numbers | sum = average * number of terms |
| median | number placed in a middle of a set |
| average of consecutive numbers | average of smallest + largest. (S + L)/2 |
| counting consecutive numbers | B - A + 1 = number of integers |
| mode | number that appears most often |
| range | highest - lowest |
| probability | p = number of favorable outcomes/total number of possible outcomes |
| area of a triangle | A = 1/2 * bh |
| isosceles triangle | two equal angles and sides |
| equilateral triangle | 3 equal 60 angles. 3 equal sides |
| Pythagorean theorem | a^2 + b^2 = c^2 |
| special triangle (right) | 3-4-5 |
| special triangle (right) | 5-12-13 |
| special triangle (30-60-90) | 1-2-sqrt3 |
| special triangle (45-45-90) | 1-1-sqrt2 |
| area of a square | A = side^2 |
| area of a parallelogram | A = bh |
| area of a trapezoid | A = 1/2 h * (b1 + b2) |
| circumference of a circle | C = 2pi*r |
| area of a circle | A = pi * r^2 |
| simple interest | interest = (principal) x (interest rate) x (time) |
| compound interest | final balance = principal * ( 1 + (interest rate/C))^((time)(C)) |
| length of an arc | arc = (n/360) x 2pi*r |
Created by:
rlw0217
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