Good to have you back!
If you've signed in to StudyBlue with Facebook in the past, please do that again.
† The material on this site is created by StudyBlue users. StudyBlue is not affiliated with, sponsored by or endorsed by the academic institution or instructor.
Get started today
Right triangle: 30-60-90
x, 2x(hypotenuse), x√3
remember to take square root when looking for "c"
Right Isosceles triangle
side : side : side √3
all sides equal
all angles equal 60°
Area of a triangle
b x h
Area of a circle
Area of a rectangle (circle)
b x h
Numbers to know
Statement 1: Sufficient- AD
Not Sufficient- BCE
person, place, thing or idea
expresses an action
modifies a noun
modifies a verb, adjective or another adverb
notes relation of a noun to an action or thing.
group of words acting as a single part of speech. A phrase is missing either a subject, verb or both.
group of words beginning with a preposition. Like any phrase, does not contain a subject or verb.
takes the place of a noun. (he, she, their, etc.)
group of words that contains a subject and verb
Two types of pronoun errors:
1. pronoun preference
2. pronoun number
See a pronoun, as yourself...
1. is it clear who/what it's referring to?
2. does it agree in number with noun it's referring to?
starts with a verb ending in -ing. (supposed to modify noun or pronoun immediately following it)
Spotting a misplaced modifier:
when a sentence begins with a modifying phrase followed by a comma, noun or pronoun right after should be what phrase is referring to.
, find the conclusion.
can be negative
sometimes called "natural" or "whole" numbers
integers can be consecutive.
integer that is only divisible by
1 & itself.
2, 3, 5, 7, 11, 13
0 nor 1 is prime
Divisible by 3
the sum of its digits is divisible by 3.
Divisible by 4
the number formed by its last two digits is divisible by 4.
28--divisible by 4.
Divisible by 6
if it is divisible by
Division by zero is undefined
test writers won't ever put a zero as the
zero in the
Numbers have a few factors
but an infinite number of multiples.
the distance between a number and zero.
is an integer but NEITHER positive or negative.
"Don't assume there are only two candidates"
just because the answer to the question is NO doesn't mean it is
Yes/no data sufficiency
yes or no-- sufficient
Order of operations
If in distributed form:
if in factored form: distribute.
Adding & subtracting fractions
fractions must have same denominator.
multiply the denominators together for a new common one.
then multiply the numerators by the same number you did the demonimator,
just multiply the numerators and denominators.
invert the second fraction and multiply
Converting mixed numbers to improper fractions
multiply the whole number by the denominator and add the numerator.
that becomes the new numerator and use the same denominator.
= 3 x 2 = 6 + 1 = 7 =
cross multiply and whichever product is larger is the larger fractions
Fraction equivalents of decimals
make the divisor a whole number by moving the decimal in the divisor as well as the dividend.
part to part relationship.
to find the whole part, set up a proportion.
look at ratio box on page 111
Compound interest problems
a little bit more than simple
quarterly= rate is divided into 4 equal parts.
semiannually= two equal parts
Harder average problems
sum of items
plug in numbers to formula
then divide total sum of remaining numbers by total number of remaining numbers
number that occurs most
can be more than one mode
1. find average
2. subtract each number from average
3. square each difference
4. average those numbers
5 take the square root of those averages
Exponents: multiplying numbers w/ the same base
add their exponents
Exponents: dividing numbers with same base
subtract the bottom exponents from the top exponents
Raising a power to a power
multiply the exponents
1/3 x 1/3 = 1/9
*** -27 is smaller than -3
Any number to the first power(x)
Any number to the 0 power is (x)
√x * √y = √xy
√12 * √3 = √36 = 6
√x/y = √x/√y
√3/16 = √3/√16 = √3/4
The square root of a positive fraction is actually larger than the original fraction:
√1/4 = 1/2
1. pick number for variables in problem
2. using numbers, find answers to problems (target answer)
3. plug numbers into answer choices to see which equals target answer
avoid using 0 or to plug in
or numbers in the problem or answer choices
for problems using percents, use 100
hours or minutes use 30 or 120
Distance = rate * time
plug in a number for total (fractions: multiply denominators)
write down the totals of each part
the number you're looking for should reduce into an answer choice
first, outer, inner, last
(x+2)(x+5)=x*x, x*5, 2*x, 2*5
When two items travel in same line toward each other...
ADD THEIR RATES
rate * time
the number inside the parentheses you plug into the expression
don't reduce functions
Number of outcomes you want / total number of possible outcomes
Probability that A & B will both happen:
A * B
1/6 * 1/6 = 1/36
Probability that A OR B will happen:
A + B
1/8 + 1/8 = 2/8 = 1/4
Odds something won't happen:
add probabilities and subtract from 1.
Odds at least 1 thing will happen:
multiply probabilities and subtract from 1
multiply all numbers together
Permutations: single source, order matters
3 teams= 3*2*1
9 teams= 9*8*7*6....
7 teams, 3 rankings= 7*6*5=210
Combination problems (single source, order doesn't matter):
1. find permutation (6*5*4)= 120
2. divide by permutation of # of objects in combination (3*2*1)=6
start top right and go counter clockwise
Find area of each face and add all together
Simple interest earned
Compound interest earned
1. divide rate by how many times compounded annually.
2. multiply that # by the principle.
3. add that # to the principle. repeat steps 2 & 3 until you reach # of compounding periods.
4. subtract principle from that #
a statement known to be true because it can be backed up with proof.
step in evaluating
Multi-source reasoning question
determine which tab or tabs contain the info you need.
must multiply by the population
37 questions total
19 problem-solving, 18 data sufficiency
75 minutes to complete
41 questions total
13 reading comprehension
17 sentence correction
11 critical reasoning
75 minutes to complete
Integrated reasoning section
12 questions total
30 minutes to complete
count more than later questions.
--start slowly, check your work
--gradually pick up the pace.
questions left unanswered will lower your score.
Most obvious answer choices...
are almost ALWAYS wrong!
Output ↓ by 10%, then ↓ again by 20%. How much would new output need to be decreased to restore original level?
1. pick a # & multiply by .10; add that to original output.
2. multiply new output by .20 & add that # to new output.
3. set up a proportion with the total amount added to the outout over the newest output = x/100 to get the percent.
On test day bring:
1. driver's license
3. a snack
4. bottle of water
tell computer to keep score
usually ask for arrangements
usually ask for groups
Integrated reasoning: pacing yourself
1. do the easier questions first.
2. don't spend too much time on one question-- sometimes its best to guess & move on.
Study the column headings first.
Then go straight to the statements
can also be negative!!!!
Formula for Set Overlap
Total # of different things= (# in Group 1) + (# in Group 2) + (# in Neither Group) + (# in Both Groups)
Want to see the other 105 Flashcards in GMAT?
JOIN TODAY FOR FREE!
Words From the Students
"The semester I found StudyBlue, I went from a 2.8 to a 3.8, and graduated with honors!"
Colorado School of Mines
Get started today
Show & Tell
StudyBlue is not sponsored or endorsed by any college, university, or instructor.
© 2015 StudyBlue Inc. All rights reserved.