GED Math
complementary angles
Two angles whose sum is 90 degrees
1 liter
approx. 1 quart
1 ton
2,000 pounds
1 yard
3 feet 36 inches
area of a parallelogram
A = bh -- Area=base x height
area of a triangle
A=1/2 bh -- Area = 1/2 base X height
order of operations
Please Excuse My Dear Aunt Sally P - parentheses E - exponents M - multiplication D - division A - addition S - subtraction
Mean or average
The sum (+) of all data divided by the number of data points
1 pint
16 ounces 2 cups
diameter of a circle
A line that passes through the center of the circle, connecting any two points d=2r -- diameter=2 X radius
scalene triangle
A triangle with sides of different lengths and no two angles are the same (sum of all angles is 180)
isoceles triangle
Triangle with 2 equal sides and 2 equal angles (sum of all angles is 180)
supplementary angles
Two angles whose sum is 180 degrees
ratio
a comparison of two numbers
improper fraction
a fraction whose numerator is larger than the denominator
bar graph
a graph that uses horizontal or vertical bars to display data
number line
a line for representing and graphing numbers. Each point on the line corresponds to a number.
bisectors
a line that divides the angle in half
transversal
a line that intersects two or more parallel lines
exponent
a mathematical notation indicating the number of times a quantity is multiplied by itself
mixed number
a number made up of a whole number and a fraction
base number
a number that has an exponent
coeffcient
a number that is being multiplied to be a variable -- in 5y the 5
table
a set of data arranged in rows and columns
variable
a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity -- in 5y the y
triangle
a three-sided polygon
right triangle
a triangle with one right angle
equilateral triangle
a triangle with three equal sides -- all angles = 60 degrees (sum of all angles is 180)
line graph
a type of graph used to show the relationship between two variables that are numbers on an x-axis and a y-axis
acute angle
angle that measures less than 90 degrees
pythagorean theorem
a²+b²=c² where c always represents the hypotenuse and a and b represent the other sides of a right triangle
equivalent fractions
different fractions that name the same amount
parentheses in a math equation
do this part first
words used in a subtraction word problem
how much more, how much less, find the difference, and deduct
adding numbers with signs
if the signs are the same (-,-) or (+,+) add the 2 numbers and label with the sign 7 + 3 = 10 -5 + (-3) = -8 If the signs are different (-,+) or (+,-) arrange with the larger number first then subtract then label the answer with the sign of the larger number 4 + -6 = -6 + 4 = -2
sum
the answer to an addition problem
remainder
the number that remains after subtraction
numerator
the part of a fraction above the line, which tells how many parts are being counted.
denominator
the part of a fraction below the line, which tells how many equal parts there are in the whole or in the group.
lowest common denominator
the smallest number, other than zero, that can be the denominator for two or more common fractions
sum of all angles in a triangle
the sum of all angles of a triangle always adds up to 180 degrees
perimeter
the sums of the lenghts of all sides of a figure
cubic units
the units volume is measured in
gross
total amount of salary before deducting taxes, espenses, etc.
1 millimeter
1/1000 of a meter
1 gram
1/28 of an ounce
1 kilogram
1000 grams 2.2 pounds
1 kilometer
1000 meters .62 miles
1 foot
12 inches
1 pound -- 1lb
16 ounces
pi
3.14
1 quart
32 ounces 4 cups
multiplying and dividing with signed numbers
Signs are alike -- answer is positive Signs are different -- answer is negative
median
The middle number in a set of numbers that are listed in order
perimeter of a triangle
add all the sids
net
amount of salary remaining after deducting taxes, expenses, etc.
monomial
an algebraic expression consisting of a single term that does not require any addition or subtraction -- 5y
straight angle
an angle that measures exactly 180 degrees
right angle
angle that is 90 degrees
center of a circle
exact middle of a circle
length
longer sides of a rectangle
words often used in division word problems
share, split, per, average and grouped into
width
shorter sides of a rectangle
parallelograms
similar to a rectangle, four sids, and each pair of opposite sides are parallel and equal
similar triangles
similar triangles have corresponding angles that are equal and corresponding sides that are proportional
words used in addtion word problems
sum, total, all together
volume
the amount of space inside a three-dimensional figure v=(pi X r squared)h -- volumn = (pi X radius squared)height
quotient
the answer to a division problem
product
the answer to a multiplication problem
the difference
the answer to a subtraction problem
circumfrence of a circle
the distance around a circle c=pi X d -- circumfrence = pi X diameter
vertex of an angle
the initial point of an angle
hundred thousandths
0.00001
ten thousandths
0.0001
thousandths
0.001
hundredths
0.01
obtuse angle
An angle that measures more than 90 degrees but less than 180 degrees
1 year
365 days 52 weeks 12 months
1 milligram
1/1000 of a gram
1 milliliter
1/1000 of a liter
divisor
the number you divide by
reducing fractions to the lowest terms
the smallest equivalent fraction
area
the measure of flat surface inside its perimeter
tenths
0.1
1 meter
39 inches
1 gallon
4 quarts 128 ounces 16 cups
pie chart
a circular chart divided into triangular areas proportional to the percentages of the whole
square root
a number that when multiplied by itself equals a given number
fraction
a small part or item forming a piece of a whole
vertical angle
either of two equal and opposite angles formed by the intersection of two straight lines
radius of a circle
is the line segment connecting the center of the circle to any point on the circle r=d/2 -- radius=diameter/2
right triangle
one of the angles is always 90 degrees, the other two sides could be the same or different but will always = 90 degrees (sum of all angles is 180)
subtracting numbers with signs
step 1: change the subtraction problem into an addition problem step 2: change the sign of the second number step 3: follow the rules of adding numbers with signs - 16 - 6 step 1: -16 + 6 = step 2: -16 + (-6) = step 3: -16 + (-6) = -22 12 - (-7) = 12 + (-7) = 12 + 7 = 12 + 7 = 19
