Obtuse Angle:
more than 90 and
less than 180
Acute Angle:
less than 90
Right Angle:
exactly 90
Perpendicular Lines:
lines that meet or cross
to form right angles
Intersecting lines:
lines that cross
or meet
Line of Symmetry:
a line you can fold a figure
along so that both halves
match exactly (opposites)
Multiples:
the products of…
a number multiplied by any
other numbers
4: 4,8,12,16,20,24,28,32…
9: 9,18,27,36,45,54,63,72…
Least Common
Multiple:
the smallest multiple that
a set of numbers share
LCM of 2 & 3 is 6
Composite Number:
a number that has
more than two factors
15: 1,3,5,15
36: 1,2,3,4,6,9,12,18,36
Prime Number:
a number that has
only two factors…
1 and itself
2, 3, 5, 7, 11, and 17
are prime numbers
Product:
the answer to a
multiplication problem
3 x 5 = 15
15 is the product
Factor:
a number in a
multiplication problem
2 x 9 = 18
2 and 9 are factors of 18
Factor Pairs:
two numbers that are
multiplied to get a product
factor pairs for 12
6 x 2 3 x 4 1 x 12
Greatest
Common Factor:
the largest factor that a
set of numbers share
GCF of 12, 18,and 30 is 6
Mean:
(find the average)
1. add all the numbers
2. divide by how many
numbers you added
Range:
LARGESTminus smallest
Number
number
2, 6, 8, 1, 7, 9, 12
12 – 1 = 11
Median:
the middle number
when listed from
smallest to largest
0, 3, 4, 6, 9, 10, 12
Mode:
the number that
occurs Most Often
3, 9, 1, 10, 3, 4, 7, 3
Equivalent
Fractions:
fractions that have
equal value
1 = 2 = 3
2
4
6
Ratio:
comparing two
quantities
3:4 3 to 4 ¾
Face:
a flat surface of a
solid
face
Edge:
the line where two
faces of a solid meet
edge
Vertex:
corner point of an angle,
polygon, or solid figure
Base:
a special face of a
solid
Congruent:
same size and
same shape
Similar:
same shape, but
different size
Quadrilateral:
a polygon with
four sides
Trapezoid:
a quadrilateral with one
pair of parallel sides
Square:
a quadrilateral with
4 equal sides, 4 right angles, & 2
pair of parallel sides
Parallelogram:
a quadrilateral with
2 pair of parallel sides
Rhombus:
a quadrilateral with
4 equal sides and 2 pair
of parallel sides
Rectangle:
a quadrilateral with
4 right angles and opposite
sides are parallel and equal
Regular Polygon:
a polygon with all equal
sides and angles
Irregular Polygon:
a polygon with unequal
sides or angles
X-axis:
the horizontal line on
a coordinate graph
X- axis
Y-axis:
the vertical line on a
coordinate graph
Y- axis
Translation:
slide
Rotation:
turn
half turn
Reflection:
flip
Area of
Rectangle:
square units
inside
length x width
Area of
Parallelogram
square
units
inside
base x height
Area of
Triangle:
square units
inside
½ (base x height)
Ordered Pair
(x,y)
right then up
(“over then up”)
Perimeter:
measurement
around the
outside
side + side + side+ side
(add all sides together)
Circumference:
measurement
around the
outside
of a circle
Volume:
cubic units
inside
length x width x height
(add ALL cubic units)
Fraction:
a part of a whole
numerator 1
denominator
3
Improper
Fraction:
numerator is
12 greater than
5 denominator
from a fraction
to a decimal
do the division
¾  34  .75
from a decimal
to a percent
multiply by 100
.75  100 = 75%
Properties
for addition and
multiplication:
identity:
equals itself
4+0=4
7x1=7
commutative:
any order
7 + 9 = 9 +7
3x5=5x3
associative:
grouped any way
(3+7)+5 = 3+(7+5)
5x(2x6) = (5x2)x6
distributive:
product of number and
sum is equal to sum of
two products
4x(2+5)=(4x2)+(4x5)
Greater than:
8 >2
Less than:
4< 9
Rounding:
1. find your place
2. look next door
3. 5 or greater,
add one more
4. digits in front
stay the same
5. all digits behind
zero is your
name
Round to nearest
thousands:
23,467 to 23,000
45,899 to 46,000
Line:
A
B
AB
Line Segment:
P
Q
PQ
Ray:
Y
Z
YZ
Radius:
line from center to
outer
edge
Diameter:
line from edge to
edge passing
through the
center
Order of
Operations:
1. ( ) or √
2. X or ÷
(from left to right)
3. + or –
(from left to right)
Diagonal:
line connecting
two vertices
Probability:
the chance an
event will occur
favorable outcome
possible outcome
2
6
“There is a 2 out of 6
chance to land on
blue.”