math review Flashcards
what are integers
negitaive and postive whole numbers
-4, 4,
mode
number that shows up most
1123456
1=mode
mode=most
median
numbers in order of least to greatest
1123456
mean
all the numbers added up divided by how many numbrs there are
1123456= 21/7
7=how many toal numbers
whats the hack to subtracting integers
keep, change oppiste
kco
**5 - 6= 5 + -6
**
keep the first number, chage the - to a +, do the opsite of the 2nd number
pemdas
say what it is
say it,
commutative property
for addition and multipication
a* b = B * a
2 numbers
23 = 3 2
associative property
for addition and multipication
(a* b) * c = (b * c) * a
3 numbers
order of numbrs is irrilvent
7 * 9 * 10 = 7 * 10 * 9
a/b =
where a is the numerator and b is the denmenator
a divided by b
distributive property
a(b + c) = a * b + a * c
distribute number to break out of the ( )
ray
one end,
other side goes on forever
segment
has an end
line
goes on forever
area of a triangle formula
a= b*h/2
area= base* hight divided by 2
constant
a term with no variables
12= a constant
term
a number with a varibale
5b 6
formula to solve for X
- get x by itself
- distribute (if needed)
- combine like terms (if needed)
- -/+ on both sides
- then / or *
doesnt matter if you choose to work with a constant or variable first
do pemda in reverse order
how to get rid of *
do the inverse which is divison
how to get rid of /
do inverse which is multipication
for what equation are we going to have to do pemdas in reverse order
equations where you have to solve for X
literal equation
an equation that invlves 2 or more variables
5x + 2y = 4
how to solve a literal equation
-2x + 5y = 12
show me how to solve for y in this example
- draw your line
- you have to get 5y by itself
- so, do inverse of -2x on both sides (+2x)
- equation is now
- (5y= 12 + 2x)
- (get rid of 5) so divide by 5 on both sides of equation
- y= 12/5 + 2x/5
ratio
compares 2 numbers by divison
can be written 3 ways
a/b
a:b
a to b
unit rate
rate with denomenator as 1
a/1
rate
a ratio that compares quantitis measured in diffrent units
cross product
a/b= c/d
a * d = b * c
x/7 = 4/5
x * 5 = 7 * 4
what is this trying to solve?
a= P% * B
a= answer, b=whole p%=percent
percent, (its trying to solve percents)
a=.28* 40
.23=p%
40=b
a=11.2
aftersaying all this describe whats written above
what is always after “of” regarding precents
the whole or “b”
(is always after “of”)
y * 3
3y
y * y * y
what does the - mean in this equation
-(4x + 12) =
-1
what is a percent equation
a= p % * b
a equals p percent times b
a is the part b is the base p is percent
what is the percent porportion
part/whole = percent/ 100
to solve you do cross product
a/b=p/100
a= part
b=base (whole)
p= percent out of 100
imdiatly after what word is base
of
after what word is part
is
