DAT Quantitative reasoning Flashcards
picking numbers strategy
- use for variables.
- percents (use 100)
- fractions (use common denominator)
- number property questions (pick a permissible number)
guessing and checking
put in answer choice B or D to determine higher or lower
Quantity A and B question strategy
- STOP: analyze the info
- THINk: think if you can simplify it
- match: match the A and B to be as close together
Quantity A and B question strategy
OF VARIABLES
TRY TO find at least two different relationships
** x can be any number
Data sufficiency Strategy
Determine if value or yes or no.
- simplify
- identify what is needed to answer the question
*** avoid reading answer choices of stuff you know!!!
12 TEN
Eliminate answer options as well
** data sufficiency
Value questions
narrow it down to one variable. if not, its insufficient or sufficient BASED ON ANSWER CHOICE
yes no questions
try to find Always yes or Always no to find sufficiency
** data sufficiency statements
ARE ALWAYS true
- if they contradict each other, then YOU MESSED UP
N variables must have
N equations usually.
*** think about sufficiency NOT
calculation
Picking numbers and data sufficiency
make sure to use TWO different numbers and it should produce a different answer (choose negative or fraction)
Data interpretation
Slow down and really think. look at axis and think about calculation required
real number
all numbers on the number line
0 is an odd or even?
even
when doing proportions, calculate based on object/ total, not trying to find number of total of anything
YEah
1/8 is
.125
1/20 is
5 %
decoding “What percent of… is..”
what follows the OF is the WHOLE and what follows Is or Are is the part
an item is 30% increase means
that its 130% higher
- must add 30 to 100%
- if subtraction, its 70%
F to C equation
5/9(F - 32)
1 mile to ft
5280 ft
I foot to inch
12 inch
1 yard to feet
3 ft
1m to yard
1.1 yard
1 kg to lbs
2.2 lbs
1 lb to g
454 g
1 lb to ounce
16 ounces
1 ounce to ml
29 is ml
1 km to mile
0.6 mile
log (s times t)
log s plus log t
log (s over t)
log s - log t
when given an exponent equation, REMEMBER TO RAISE
TO the opposite power to get rid of it!!!
SAY THE quadratic equation
-b +/ b squared - 4 ac / 2a
careful with algebra!!!
YES
when it says how many
immediately go to combinations
exterior angles of a triangle
add up to 360
name two pythagorean triples
3,4,5
5,12,13
45 degree triangle
1:1:root 2
30 60 triangle
1: root 3: 2
rhombus, parallelogram area
area of base times height where height is straight up
length of an arc
(n/360) times 2 pi r
area of a sector
(n/360) times pi r squared
SA of a sphere
4 pi r squared
volume of sphere
4/3 pi r cubed
distance formula
subtract x and y, square and ADD then square root
graphing inequalities
first graph eqn, then look at sign to see if area is above or below
area of equilateral triangle
side squared times root 3 divided by 4
trapezoid area
base 1 + base 2/ divided by 2 times height
** no need to know the triangle side
evaluating using coordinate plane
draw the triangle, PLOT IT and use those to find the value
- DONt subtract or add anything. the value is just that
