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CRCT REVIEW
MATH
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PLACE VALUE
ORDERED PAIR
(1,2)
A pair of numbers used
to locate a point on a
coordinate plane;
the first number tells
how far to move
horizontally
and the second number
tells how far
to move vertically
relation
• A set of ordered pairs
Example:
(5,1)
(10,2)
(15,3)
(20,4)
(25,5)
GREATEST COMMON
FACTOR
• The greatest factor that two or more numbers
have in common
Example:
18: 1, 2, 3, 6, 9, 18
30: 1, 2, 3, 5, 6, 10, 15, 30
6 is the GCF of 18 and 30.
MULTIPLES
• multiple
• The product of a given whole number and
another wholeExample:
number
percent
• The ratio of a number to 100; percent
means "per hundred
measure of central tendency
• A measure used to describe data; the
mean, median, and mode are measures of
central tendency.
mean
• The number found by dividing the sum of a
set of numbers by the number of addends;
see also average
Example:
74, 91, 63, 92, 85
mode
• The numbers or items that occur most
often in a set of data
Example:
The mode of 1, 3, 4, 4, and 6 is 4.
median
• The middle number or the average of the
two middle numbers in an ordered set of
data
Example:
The median of 1, 3, 4, 6, and 7 is 4.
range
• The difference between the greatest and
least numbers in a set of data
Example:
The greatest temperature is 83°F.
The least temperature is 80°F.
Since 83 - 80 = 3, the range is 3°F.
number line
• A line with equally spaced tick marks
named by numbers (POSITIVE AND
NEGATIVE INTEGERS)
• Example:
A number written as the product
of all its prime factors
prime number
• A whole number greater than 1 whose
only factors are 1 and itself
• Example 1,2, 3, 5,
• Not prime 4, 8, 12,
composite number
• A whole number that has more than two
factors
21: 1, 3, 7, 21
• Example: 4: 1, 2, 4
• Example:
parallel lines
• Lines in a plane that never intersect
perpendicular lines
• Two lines that intersect to form four right
angles
congruent
Having the same size and shape
Example:
The triangles are congruent.
line of symmetry
A line that divides a figure into two
congruent parts
similar figures
Figures with the same shape but not
necessarily the same size
Name
Sides
Angles
Triangle
3
3
Quadrilateral
4
4
Pentagon
5
5
Hexagon
6
6
Heptagon
7
7
Octagon
8
8
Nonagon
9
9
Decagon
10
10
FACE
• A polygon that is a flat surface of a solid
figure
Right Triangle
• A RIGHT triangle has ONE right angle.
obtuse triangle
A triangle that has one obtuse angle
Example:
Acute Triangle
• An ACUTE triangle
has THREE acute
angles.
• The ratio of the circumference of a circle to
its diameter
circumference
The distance around a circle
Example:
Diameters • A DIAMETER of a
circle is a chord that
contains the center
of the
circle. Diameter CV,
diameter DT,
diameter GH,
diameter EU, etc.....
Radius
•
•
•
•
•
•
•
A line segment with
one endpoint
at the center
of a circle
and the other
endpoint
on the circle
• acute angle
• An angle that has a measure less
than a right angle (less than 90°)
Example:
Straight Angle
• A STRAIGHT ANGLE is
one whose measure is
EXACTLY 180
DEGREES. A straight
angle is made up of two
opposite rays. Another
important fact is that a
straight angle forms a
straight line.
Obtuse Angle
• An OBTUSE ANGLE
is one whose
measure is
GREATER THAN 90
AND LESS THAN
180 DEGREES.
Right Angle
• A RIGHT ANGLE is
an angle whose
measure is
EXACTLY 90
DEGRRES. Right
angles are denoted
by a small square in
its interior.
VERTEX • The common point for both rays is
called the Vertex.
Identify the Triangles
• Triangles are also classified according to their
length.
• Scalene Triangle- no congruent sides
• Isosceles Triangle- two congruent sides
• Equilateral Triangle- three congruent
sides
area
The number of square units needed to cover a
surface
Example:
The area is 9 square units.
Perimeter
• The distance
• around a figure
• 2 cm + 3 cm + 3 cm
• = 8 cm
The perimeter of this figure is 8 centimeters
VOLUME
• The measure of the amount of space a
solid figure occupies
The volume
of this figure
is 24 cubic
units
PRISM
• A solid figure that has two congruent,
polygon-shaped bases, and other faces
that are all rectangles
pyramid
• A solid figure with a polygon base and all
other faces triangles that meet at a
common vertex
Associative Property
• The property that states that the way
addends are grouped or factors are
grouped does not change the sum or the
product
12 + (5 + 9) = (12 + 5) + 9
(9 x 8) x 3 = 9 x (8 x 3)
Commutative Property
• The property that states that when the
order of addends or factors is changed,
the sum or product is the same
9+4=4+9
6x3=3x6
greater than (>)
A symbol used to compare two numbers,
with the greater number given first
Example:
8>6
8 is greater than 6.
FRACTION
• A number that names a part of a whole or
a part of a group