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- StudyBlue
- Massachusetts
- University of Massachusetts, Amherst
- Biobehavioral Health
- Biobehavioral Health 101
- Mr
- Quant Gmat

Jordan K.

Size:
114
Formula for G1, G2, Both and Neither

Total = Group (1) + Group (2) - Both + Neither

Evenly Spaced Sets

In any evenly spaced set (i.e. even number set w/ linear spacing), the mean = median

Combination Rate w/in W=RxT

Combo rates are calculated by "Adding" the two rates

Linear equations and # of Unknowns

If the equations are linear and equate to the number of unknowns, you can solve for each variable

Finding the avg question

1) take difference from the mean

2) set the two groups with 2 different averages equal to 0 (like: (# Group 1 x avg) + (# Group 2 x avg) = 0, solve for the variable not given

3) take variable and subtract or add to the given consolidated average to find the answer

% of a Solution

when given two different solutions with specific %'s for each, and then are given a consolidated solution with a new %, set your equation up like this: (%_{A}*X + %_{B}(total solution - X) = %_{Consolidated} * Total Solution)

Lock combination Problems

Quadratic Equation Possibilities w/ two variables

Algebraic Expressions (Number Lines)

Terminating Decimals

Arithimetic Progression

Overlapping Set Formulas

Finding Exactly 2 w/ Overlapping Sets

(1-x)^{2 }is equivalent to?

DS problems: when a problem does not give you any concrete numbers

What is a mid-segment, and what is its size?

The ratio between 2 similar triangle areas

When a triangle is inscribed in a circle

Square roots of 2, 3, and 5

Rule for Triangle Sides

Circular Permutations

Absolute Expressions

Shortcut to know if a number is divisible by 12

Shortcut to know if a number is divisible by 4

Shortcut to know if a number is divisible by 3

Shortcut to know if a number is divisible by 11

Median of a set of consecutive integers

When a question asks what is a number when rounded what do you do?

6.4 = x/100 * 16,000

Similar Triangle Rule

when you have points (m , n) and (-m, -n) on the same line

Similar Triangles, when Areas are in a ratio to one another

Negative Exponents in the Denominator

For D=RxT problems when Distance is fixed

Adding multiple volumes

Similar Triangles: Perpendicular line to Hypotenuse

(1-x)^{2 }is the same thing as?

Binomial Probability Distribution Formula

Hexagon is split into?

Triangle measuring rule for side lengths

Discriminate of a quadratic

Time needed for two workers working simultaneously

Time needed for three workers working simultaneously

Equation of a circle when not at the origin

Equation of a circle when the center is at the origin

Max/Min problems

Max area for a triangle with a given perimeter

Quick tip for finding perfect squares

When dealing with indistinguishable objects what do you use (permutation or combination)?

Finding the side of a triangle (or any shape for that matter)

Pythagorean Triples

In y=mx+b form, if x-int is negative

x-int can be expressed as?

a number with decimals with an exponent

when a question asks for the remainder, but the question is divided by 10

Selecting T items from the group N

Finding the avg. rate for D=RxT problems

When choosing smart numbers

Teeter-Totter Method/Mapping Method for Weighted Averages

Consecutive Even/mulitple Integers Count

Properties of evenly spaced sets

Sum of integers for an evenly spaced set

Multiple of 3 with consecutive integers

Adding/subtracting multiples of N

Even/Odd Rules for addition/subtraction

Even/Odd Rules for Multiplication

"And" and "Or"

In a Q, what does "How Many" signal?

Whenever a question involves making decisions you have 2 cases:

Adding/subtracting a multiple of N with a Non-Multiple of N

Adding 2 non-multiples of N

GCF and LCM

If 2 numbers have no primes in common

Finding the remainder

Combining roots

Hidden Quadratic Equations

Quadratics and Square Roots

Linear equation and basic math operation

Combo questions in disguise

Complex Absolute Value Expressions: Same variable, but 2 absolute value expressions

The conjugate of an expression

Direct Proportionality

Indirect Proportionality

Reciprocals of Inequalities

Squaring Inequalities

Triangle inscribed in a circle with 1 side as the diameter

Define: quadrilateral

Define: Parallelogram

Define: Square

Define: Trapezoids

Formula: Sum of interior angles

Define: Hexagon

GMAT Volume Trick

Inscribed angle

Define: Rhombus

Max area with fixed perimeter: Quadrilaterals

Smallest perimeter with fixed area: Quadrilaterals

Max area of a triangle or parallelogram

Shortcut: Area of equilateral triangle

Similar Triangles

Diagonal of a cube

Diagonal of a rectangle

Recognizing patterns

DS: Standard set of numbers for testing cases

Units digit pattern for 1-5 raised to the x

Units digit pattern for 6-10 raised to the x

Adding "Square of a sum" and Square of a difference"

Subtracting "Square of a sum" and Square of a difference"

Base Line Average

Base Line Calculations

The Divisor vs. The Remainder

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