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Math Vocabulary (Pre-Algebra)
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As the school year goes on I will add new words to this list for you to study.
Terms in this set (49)
Order of Operations
The way in which an expression is to be evaluated--PEMDAS. 1. parentheses 2. exponets 3. multiplication and division from left to right 4. addition and subtraction from left to right
Proportion
An equation that states that two ratios are equal
Ratio
A comparison of two numbers by division
Sum
A quantity obtained by addition
Product
A quantity obtained by multiplication
Quotient
The number obtained by division
Polygon
A closed plane figure bounded by straight sides
Area
The number of square units needed to cover a flat surface
Volume
The amount of 3-dimensional space occupied by an object
Adjacent Angles
Two angles that share a vertex and a side but have no interior points in common.
Coefficient
A number multiplied by a variable in an algebraic expression.
Distance Formula
D=RT
Distance = Rate * Time
Hypotenuse
In a right triangle, it is the longest side which is opposite the right angle
Rational Number
Any number written as a quotient of two integers where the denominator is not zero.
Prism
A solid with two parallel and congruent polygonal faces called bases. Named for the shape of its base.
Surface Area
The sum of the areas of all the faces of a solid figure
Acute Angle
An angle less than 90 degrees but more than 0 degrees
Congruent
Having the same size and shape
Exponent
Describes the number of times a quantity (base) is multiplied by itself
Reciprocal
The inverse of a fraction; when multiplied by the original fraction, it results in a product that equals one
Mean
an average of numbers computed by adding the numbers and dividing by the total number of numbers
ex. 1, 2, 3
3 + 2 + 1 = 6
6 / 3 = 2
The mean is 2.
Median
The middle number in a set of numbers that are listed in order
Mode
The most frequent value of a numbers in a data set
Range
The difference between the least and greatest values in a set of numbers
Perimeter
The total distance around a polygon.
Circumference
The distance around a circle.
C = 2r(pi) or C = d(pi)
Straight Angle
An angle the measures a 180 degrees
Supplementary Angle
When the sum of the measures of a pair of angles add up to 180°
Complementary Angle
Two angles whose measures add to 90°
Reflection
A mirror image of a figure shown over a line of reflection
Chord
A straight line connecting two points on a curve
Composite Numbers
A whole number greater than 1 that has more than two factors
Equivalent
Equal in amount or value
Experimental Probability
The probability of an event based on the repeated trials of that event
Theoretical Probability
Probability based on comparing the number of possible favorable outcomes to the number of total possible outcomes
Faces
The flat surfaces of a 3-D figure
Parallel
Lines going in the same direction and always the same distance apart. The lines never meet or cross each other.
Perpendicular
Two lines that intersect at a 90 degree angle.
Parallelograms
A quadrilateral (4-sided figure) that has both pairs of opposite sides are equal and parallel. Example: all rhombi, (plural for rhombus), squares and rectangles
Quadrilateral
A four-sided polygon
Radius
The distance from the center of a circle to any point on the circle.
Diameter
The length of a straight line passing through the center of a circle and connecting two points on the circumference
Variable
A symbol used to represent an unknown number, usually a lower case letter; y, a, b, x.
Real Numbers
The set of numbers that includes rational and irrational numbers.
Irrational Numbers
Numbers that cannot be expressed as a ratio of two integers. Their decimal expansions are nonending and non-repeating. Pi is an example.
Absolute Value
The distance a number is from zero on a number line (positive)
Associative Property
Changing the grouping of numbers will NOT change the value. For example: (7 + 4) + 8 = 7 + (4 + 8) also works with multiplication
Commutative Property
In mult or add, the order of two numbers may be switched around and the answer is the same.
Ex: 1 + 2 = 2 + 1
Ex: 3
4 = 4
3
Pi
The ratio of the circumference to the diameter of a circle
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