GMAT FlashCards

Arithmetic: Weighted Average

(w1x1 + w2x2) / total weight

Arithmetic: Simple Interest

(P×R×T)/100

Arithmetic: Percentage Change

(New − Old) / Old × 100

Arithmetic: Successive % Change

a + b + (ab/100)

Arithmetic: Profit

SP − CP

Arithmetic: Loss %

(Loss / CP) × 100

Arithmetic: Average

Sum / Number

Arithmetic: Ratio

a:b = a/b

Arithmetic: Compound Interest

A = P(1 + r/n)^(nt)

Arithmetic: Mixture

Weighted average concept

Arithmetic: Marked Price

MP = CP × (1 + markup%)

Arithmetic: Discount

SP = MP × (1 − discount%)

Number Properties: Even × Odd

Even

Number Properties: Odd × Odd

Odd

Number Properties: Prime Number

Only 2 factors

Number Properties: LCM

Least common multiple

Number Properties: HCF

Highest common factor

Number Properties: Remainder Formula

Dividend = Divisor × Q + R

Number Properties: Units Digit

Cycles repeat (usually 4)

Number Properties: Divisible by 3

Sum of digits divisible by 3

Number Properties: Divisible by 9

Sum of digits divisible by 9

Number Properties: Factor Count

(a+1)(b+1)...

Algebra: (a+b)^2

a² + 2ab + b²

Algebra: (a−b)^2

a² − 2ab + b²

Algebra: a^2 − b^2

(a+b)(a−b)

Algebra: Quadratic Formula

(-b ± √(b²−4ac))/2a

Algebra: Linear Equation

ax + b = 0

Algebra: Inequality Rule

Flip sign if × or ÷ negative

Algebra: Absolute Value

Distance from zero

Algebra: Function

f(x) = expression

Algebra: Exponent Rule

a^m × a^n = a^(m+n)

Algebra: Zero Exponent

a^0 = 1

Word Problems: Speed

Distance / Time

Word Problems: Time

Distance / Speed

Word Problems: Distance

Speed × Time

Word Problems: Work

Rate × Time

Word Problems: Pipes

Same as work

Word Problems: Relative Speed

Add/subtract speeds

Word Problems: Boats & Streams

Adjust for current

Geometry: Triangle Sum

180°

Geometry: Pythagoras

a² + b² = c²

Geometry: Rectangle Area

l × b

Geometry: Square Area

a²

Geometry: Circle Area

πr²

Geometry: Circumference

2πr

Geometry: Straight Line Angle

180°

Geometry: Polygon Sum

(n−2)×180

Probability: Probability

Favorable / Total

Probability: Complement

1 − P(event)

Probability: Independent Events

Multiply probabilities

Probability: At Least

Use complement

Permutation & Combination: Factorial

n!

Permutation & Combination: nPr

n!/(n−r)!

Permutation & Combination: nCr

n!/(r!(n−r)!)

Permutation & Combination: Permutation

Order matters

Permutation & Combination: Combination

Order doesn't matter

Data Sufficiency: Goal

Check sufficiency not solution

Data Sufficiency: Statement 1

Check alone

Data Sufficiency: Statement 2

Check alone

Data Sufficiency: Combine

Only if needed

Data Sufficiency: Yes/No Questions

Same answer required

Verbal SC: Subject-Verb Agreement

Match number

Verbal SC: Modifier Rule

Next to what it modifies

Verbal SC: Parallelism

Same grammatical structure

Verbal SC: Pronoun Reference

Clear and unambiguous

Verbal CR: Strengthen

Support argument

Verbal CR: Weaken

Attack assumption

Verbal CR: Assumption

Hidden link

Verbal CR: Inference

Must be true

Verbal RC: Main Idea

Primary purpose

Verbal RC: Tone

Author attitude

Verbal RC: Inference

Logical conclusion

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