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 whole number

Example:

                                

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

• Example: 21: 1, 3, 7, 21

• Example: 4: 1, 2, 4

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

6 x 3 = 3 x 6

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