GRE Math Formulas to Know
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27 terms
Terms | Definitions |
|---|---|
 Percentages General Formula | Percent x Whole = Part |
| Percentages: % Increase | (Amount of Increase/ Original whole ) x 100% |
| Percentages: % Decrease | (Amount of Decrease/ Original Whole) x 100% |
| Percentages: New Whole | New Whole = Original Whole + or - Amount of Change |
| Percentages: Out of 10 | 10% = 1/10 20% = 2/10 = 1/5 30% = 3/10 40% = 4/10 = 2/5 50% = 5/10 = 1/2 60% = 6/10 = 3/5 70% = 7/10 80% = 8/10 = 4/5 90% = 9/10 100% = 10/10 = 1 |
| Percentages: Out of 8 | 12-1/2% = 1/8 25% = 2/8 = 1/4 37-1/2% = 3/8 50% = 4/8 = 2/4 = 1/2 62-1/2% = 5/8 75% = 6/8 = 3/4 87-1/2% = 7/8 |
| Percentages: Out of 6 | 16-2/3% = 1/6 33-1/3% = 2/6 = 1/3 50% = 3/6 = 1/2 66-2/3% = 4/6 = 2/3 88-1/3% = 5/6 |
| Percentages: Other | 5% = 1/20 20% = 1/5 |
| Prime Number | ... |
| Integer | ... |
| Acute Angle | an angle that is less than 90° |
| Right Angle | an angle that 90° |
| Obtuse Angle | an angle that is greater than 90° but less than 180° |
| Straight Angle | an angle that is 180° exactly |
| Reflex Angle | an angle that is greater than 180° |
| Area of a Square | A^2 |
| Area of a Rectangle | AB |
| Area of a Parallelogram | BH |
| Trapezoid Area | H/2 (b1 + b2) |
| Circle Area | Pi (r^2) |
| Ellipse Area | Pi (r1*r2) |
| ... | triangle = (1/2) b h |
| Quadratic Equation | negative b plus or minus the square root of b squared minus 4ac all over 2a. |
| Distance | D= Rate x Time |
| Simple Interest Formula | Interest = principal x rate x time *RATE must be expressed as a decimal point *TIME must be expressed in years |
| Amount of Investment Formula | To compute the amount, A, of an investment, P, at the end of T years, at an annual rate of R: A = P (1 + RT) |
| Compound Interest Formula | A = P ( 1 + R/C)^TC A = AMOUNT of investment P = PRINCIPLE amount invested R = RATE of interest C = the number of times compounded annually T = TIME in years |
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