Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
66 Cards in this Set
- Front
- Back
|
percent formula
|
part=percent x whole
|
|
|
percent increase/decrease
|
=(amount of increase or decrease)/(original whole) x 100%
|
|
|
sum or diff. even?
|
two odd=even
two even=even even/odd=odd |
|
|
product/quotient even?
|
two even=even
even odd=even two odd=odd |
|
|
multiples of 2
|
even
|
|
|
multiples of 3
|
sum of digits is multiple of three
|
|
|
multiples of 4
|
sum of last two digits multiple of 4
|
|
|
multiples of 5
|
last digit is 5 or 0
|
|
|
multiples of 6
|
sume of digits is a multiple of three and last digit is even
|
|
|
multiples of 9
|
sum of digits is a multiple of 9
|
|
|
multiples of 10
|
last digit is 0
|
|
|
multiples of 12
|
sum of digits is a multiple of 3 and last two digits are a multiple of 4
|
|
|
how to find a common factor
|
factor each down to prime, multiply shared prime factors (including multiples of same # if shared)--use all possible combinations to find all common factors
|
|
|
how to find a common multiple
|
factor #s down to prime, find product of original #s, divide common primes into product
|
|
|
average
|
sum of terms/number of terms
|
|
|
use average to find sum
|
sum=average x number of terms
|
|
|
average of consecutive #s
|
average smallest and largest
|
|
|
count consecutive #s
|
# of integers from A to B inclusive is B-A+1
|
|
|
Sum of consecutive #s
|
sum=average x # of terms
average highest and lowest, multiply by # of terms |
|
|
median
|
put #s in numerical order, take the middle #, or average the two middle terms
|
|
|
mode
|
# that appears most often, ties for most often means more than one mode
|
|
|
range
|
positive difference between highest and lowest values
|
|
|
ratio
|
of # goes on top, to # goes on bottom
|
|
|
use ratio to determine actual #
|
set up proportion, solve (cross multiply, divide)
|
|
|
use actual #s to determine rate
|
identify quantities and units, keep units straight--i.e. convert hours to minutes, etc.
|
|
|
charts, tables, graphs
|
read question and labels carefully, ingnore extraneous information, pay attention to spread in choices, approximate when possible
|
|
|
count # of possibilities
|
usually just do manually--small quantities
|
|
|
simple probability
|
number of favorable outcomes/total # of possible outcomes
|
|
|
new symbols
|
follow instructions, treat like any variable symbol
|
|
|
simplify polynomials
|
multiply to eliminate all parentheses, combine like terms
|
|
|
factoring certain (special) polynomials
|
ab+ac=a(b+c)
a^2+2ab+b^2=(a+b)^2 a^2-2ab-b^2=(a-b)^2 a^2-b^2=(a-b)(a+b) |
|
|
solve for one variable in terms of another
|
finding x in terms of y, isolate x on one side, y will be the only variable on the other
|
|
|
solve an inequality
|
treat it like an equation, BUT reverse the sign if you multiply or divide by a negative #
|
|
|
absolute values
|
number's distance from zero on the number line, abs. value of x=3 could be 3 or -3, abs. val. of (x-3)<2 means solve (x-3)<2 and -(x-3)<2 to find a range
|
|
|
addition words
|
sum, plus, and, added to, more than, increased by, combined with, exceeds, total, greater than
|
|
|
subtraction words
|
difference between, minus, subtracted from, decreased by, diminished by, less than, reduced by
|
|
|
multiplication words
|
of, product, times, multiplied by, twice, double, triple, half
|
|
|
division words
|
quotient, divided by, per, out of, ratio of __ to __
|
|
|
equal words
|
equals, is, was, will be, result is, adds up to, costs, is the same as
|
|
|
angle formed by intersecting lines
|
all equal 360, opposites are equal, adjacent=180
|
|
|
transversal across parallel lines
|
acute all equal, obtuse all equal, acute+obtuse=180
|
|
|
solve for one variable in terms of another
|
finding x in terms of y, isolate x on one side, y will be the only variable on the other
|
|
|
solve an inequality
|
treat it like an equation, BUT reverse the sign if you multiply or divide by a negative #
|
|
|
absolute values
|
number's distance from zero on the number line, abs. value of x=3 could be 3 or -3, abs. val. of (x-3)<2 means solve (x-3)<2 and -(x-3)<2 to find a range
|
|
|
addition words
|
sum, plus, and, added to, more than, increased by, combined with, exceeds, total, greater than
|
|
|
subtraction words
|
difference between, minus, subtracted from, decreased by, diminished by, less than, reduced by
|
|
|
multiplication words
|
of, product, times, multiplied by, twice, double, triple, half
|
|
|
division words
|
quotient, divided by, per, out of, ratio of __ to __
|
|
|
equal words
|
equals, is, was, will be, result is, adds up to, costs, is the same as
|
|
|
angle formed by intersecting lines
|
all equal 360, opposites are equal, adjacent=180
|
|
|
transversal across parallel lines
|
acute all equal, obtuse all equal, acute+obtuse=180
|
|
|
area of a triangle
|
1/2 base x height
|
|
|
isosceles triangles
|
two equal sides, two equal angles
|
|
|
equilateral triangles
|
three equal sides, angles 60 each
|
|
|
similar triangles
|
angles equal, sides proportional
|
|
|
pythagorean
|
a^2+b^2=c^2 in a right triangle
|
|
|
special right triangles
|
3-4-5, 5-12-13, 30-60-90, 45-45-90 (right isosceles)
|
|
|
perimeter of a rectangle
|
2(length+width)
|
|
|
area of a rectangle
|
length x width
|
|
|
area of a square
|
side^2
|
|
|
area of a parallelogram
|
base x height
|
|
|
area of a trapezoid
|
break into parts to calculate and add them all up, or average of parallel sides x height
|
|
|
circumfrence
|
2pi r
|
|
|
area of a circle
|
pi r^2
|
|
|
distance between points on a coordinate plane
|
if there's an x or y in common, just subtract the #s that are different, if not, construct a right triangle and calculate hypotneuse
|
|
|
slope of a line
|
change in y/change in x
|
