Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

SAT > Math > Flashcards

Math Flashcards

1
Q

Integers

A

positive, negative, and zero whole numbers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

integer zero even or odd

A

neither or even

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

even+even=

A

even

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

odd+odd=

A

even

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

odd+even=

A

odd

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

evenXeven=

A

even

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

oddXodd=

A

odd

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

oddXeven=

A

even

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

to find the least positive integer divisible by a number

A
  1. eliminate smaller numbers (if one of the numbers is 4, eliminate 2)
  2. multiply them all together and check to see if thats the lowest possible
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

when you divide any positive integer by three

A

the remainder must be less than or equal to 2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

prime number

A

number whose only factors are 1 and itself

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

union of sets

A

all the numbers from both in one, duplicates not repeated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

intersection of sets

A

one the numbers that are repeated in both sets

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

combinations problems (how many combinations of this are possible)

A

multiply the number of choices from each section together

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

permutations and combinations

A

combinations that are limited after every round. ex. theres a four letter password but no letter can be used more than once. so do 26x25x24x23. order doesn’t matter.

there are 12 students in a class, 2 will be chosen, how many different pairs? 12X11 then divide by 2 since they can be chosen 2 different ways

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

difference of two squares a^2-b^2

A

(a+b)(a-b)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

when an exponent is raised to a second exponent like (n^3)^6

A

multiply them

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

working with “unsolvable” equations

A

if an equation is unsolvable, factor it and plug in the value given

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

inversely proportional word problem

A

a=k/b, plug in numbers you know to find k, plug in the rest to find your answer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

a car traveling at an average rate of blank can make the trip in blank, how much longer would it be going at this rate

A

use distance formula

21
Q

complementary angles

A

two angles whose measures have a sum of 90degrees

22
Q

30 60 90 triangles legs

A

short leg=x
long leg=xroot3
hypotenuse=2x

23
Q

45 45 90 triangle legs

A

equal legs=x

hypotenuse= xroot2

24
Q

3-4-5 triangles

A
  • the sides have a ration of 3:4:5
  • short leg=3x
  • other leg=4x
  • hypotenuse=5x
  • so if x=2 then the leg lengths are 6, 8, and 10
25
Q

congruent triangles

A

same size and shape

26
Q

similar triangles

A

same angles, different size but ratio of sides are the same

27
Q

two triangles are similar if

A
  • two pairs of corresponding angles each have the same measure
  • one pair of corresponding angles has the same measure, and the pairs of corresponding sides that form those angles have lengths that are in the same ratio
28
Q

the sum of any two sides of a triangle

A

is greater than the length of the third side

29
Q

parallelogram

A
  • slanted rectangle

- equal opposite angles

30
Q

rectangles

A

type of parallelogram

31
Q

squares

A

type of rectangle

32
Q

square sliced in half

A

two 45-45-90 triangles

33
Q

area of a triangle

A

(1/2) bh

34
Q

area of a parallelogram

A

length times height

35
Q

regular polygon

A

a polygon whose sides all have the same length and whose angles all have the same measure

36
Q

angles in a polygon

A

180(n-2)

37
Q

arc

A
  • piece of circle with rounded edge (like pie piece)
  • number of degrees in the arc equals the number of degrees in the angle formed by the two radii at the center of the circle called the central angle
  • aka curved angle in degrees equals the degree
38
Q

tangent

A

line that touches circumference at one point, straight

39
Q

circumference equation

A

2pir or pid

40
Q

area of a circle

A

pir^2

41
Q

volume of a prism

A

height times area of its base

42
Q

volume of a right circular cylinder

A

V=pir^2h

43
Q

distance formula

A 
d= square root (X2-X1)^2+(Y2-Y1)^2
distance= rate x time
44
Q

Point of symmetry

A
  • point of rotation

- doest change the point or the shape

45
Q

weighted average

A

the average of two or more groups that do not all have the same number of members.
(#x members)+(#x members) over the total number of people

ex. 15 members had an average score of 500, the remaining 10 had an average of 550.
(500X15)+(550X10) over 25= 520

46
Q

average of algebraic expressions

A

average/arithmetic mean of 3x+1 and x-3 is just (3x+1)+(x-3) over 2

47
Q

using averages to find missing numbers

A
  • sum of a list of values over number of values on the list=average
  • average X number of values = sum of values
  • once you ring the sum of the second set of values, subtract it from the sum of the first
48
Q

independent probability

A

the outcome of either event has no effect on the other. multiply the probably of each event together to get total probability

SAT (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions