Addition 
The total amount of two or more numbers.
The answer of adding numbers is the sum.
Example: 1+2 = 3; 3 is the sum of the addition of 1 and 2.

Algebra 
A branch of math using letters to represent numbers.
Example: x + 7 = 15. (Solve for x; x = 8) 
Arithmetic 
The use of addition, subtraction, multiplication, and division to find an answer.
Example: 4+12=16; 124=8; 12/4=3; 2*8=16 
Circle 
A curved line with every point equal distance from the center.
Example:

Composite Number 
Any whole number that can be divided by another number evenly except by itself and 1
Examples: 21 (21/7=3), 24 (24/4=6), 9 (9/3=3), 10 (10/2 = 5) 
Congruent 
Equal angles.
Example: 45 degrees and 45 degrees. 
Coordinate Axis 
Two perpendicular lines forming four quadrants. 
Counting Number 
Same as "Natural Number." 
Denominator 
The bottom number in a fraction
Example:3/4, 4 is the denominator. 
Difference 
The amount numbers differ from each other.
Example: 107=3 the difference of 10 and 7 is 3 
Directrix 
A fixed line associated with a parabola . 
Dividend 
The number being divided.
Example: 15 ÷3=5; 15 is the dividend. 
Division 
The discovery to find out how many times a number is contained in another number.
Example: 15 ÷3=5; 3 is in 15 five times. 
Divisor 
The number to divide with.
Example: 15÷3=5; 3 is the divisor. 
e 
The number used as the base for natural logarithms.
e = 2.71828183 
Ellipse 
A curved line with the sum of the distances from imaginary points (foci) to each point on the curve is constant 
Exponent 
A small figure placed to the upperright of a number showing the number of times to multiply that number by itself.
Example: 3² (3x3=), 2³ (2x2x2 = 8) 
Focus 
An imaginary point seen in parabolas, hyperbolas, and ellipses. Plural: foci. 
Fraction 
A representation of division and another way of showing decimals.
Examples: 3/4 means 3 divided by 4, which is .75. Also, 1 ½ is the same as 1.5. 
Geometry 
The branch of mathematics that deals with points, lines, planes and figures. 
Hexagon 
A sixsided polygon. 
Hyperbola 
A curved line with the difference of the distances from imaginary points (foci) to each point on the curve is constant. 
Imaginary Number 
An even root of a negative number; square root of 1 is denoted as 'i.'
The square root of 4 cannot be 2 because (2*2 = 4, not 4).
Examples: i, 5i, etc. 
Improper Fraction 
A fraction that has its numerator of the larger than the denominator.
Example: 25/12, 3/2, etc. 
Inequality 
An equation written with a greater than, a less than sign, or a not equal to sign. Basically, an equation without an equals sign.
Examples: 7 + x > 10; 1 + 2 < x. 
Integer 
Any positive or negative whole number and zero.
Example: 3, 2, 1, 0, 1, 2, 3,... 
Line 
An infinite path connecting an infinite number of points. A linear line is perfectly straight (diagonal/verticle/horizontal.) 
Logarithm (Log) 
The power to which a number is raised  the exponent.
Example: 
Mixed Number 
A whole number and a fraction.
Example: 3½ 
Multiplication 
The repeated addition of a number.
Example: 4x4 = (4+4+4+4) = 16. 
Natural Log 
Logarithm with base e
Example: ln 5 
Natural Number 
Any positive, whole number.
Example: 1, 2, 3, 4,... 
Numerator 
The top number in a fraction.
Example: 4/5; 4 is the numerator. 
Octagon 
An eightsided polygon. 
Parabola 
Set of points equal distance from a focus and a directrix. 
Parallel 
Two (or more) lines that will never intersect. (Lines with the same slope.)
Examples: Y = 3/4x + 2 and Y = 3/4x + 5 are parallel lines. 
Pentagon 
A fivesided polygon. 
Percent 
A number out of 100. The percent can be greater than 100.
Example: 50%, 75%. 
Perpendicular 
Lines that intersect at right angles (90 degrees.) 
Pi 
The ratio of the circumference to the diameter of a circle (3.1415926...) 
Plane Geometry 
The branch of geometry using only twodimensional figures. 
Point 
A location with no dimensions, shape, or size. 
Polygon 
A closed figure with at least four sides and four angles. 
Prime Number 
Any integer that cannot be divided by another number evenly except by itself and 1.
Examples: 2, 3, 5, 7, 11, 13,... 
Product 
The result of multiplying two or more numbers together.
Example: 4x4=16; 16 is the product. 
Pyramid 
A shape with a polygonal base and triangular sides meeting at a common point (vertex.) 
Quadrant 
One quarter (1/4) of a coordinate plane axis. 
Quadrilateral 
A foursided polygon. 
Quotient 
The answer of one number divided by another.
Example: 33÷3 = 11; 11 is the quotient. 
Radical 
A root sign. 
Ray 
A line having one endpoint, where the other endpoint continues to infinity. 
Real Number 
Any number that is not imaginary. 
Rectangle 
A quadrilateral with four right angles. 
Regular Polygon 
A polygon with all sides equal and all interior angles congruent 
Rhombus 
A quadrilateral with equal sides. 
Right Angle 
A 90 degree angle. 
Segment 
A piece of a line with two endpoints. 
Solid Geometry 
The branch of geometry using 3D objects and figures. 
Space 
The 3D continuous expanse and of the matter contained within; volume. 
Square 
A rectangle with all four sides equal. 
Square Root 
The number that when multiplied by itself will produce a given number (the square.)
Example: square root of 4 = 2 because 2x2 = 4. 
Subtraction 
Getting the difference between two numbers. 
Sum 
The answer from adding numbers
Example: 2+4=6; 6 is the sum. 
Transversal 
A line that intersects at least two other lines. 
Trapezoid 
A quadrilateral with only two sides parallel. 
Vertex 
A corner point of a geometric figure formed by lines, planes, or both. 
Vertical Angle 
Equal angles formed by the intersection of two or more lines. 
Whole Number 
Any positive integer, some definitions include 0.
Example: 1, 2, 3, 4,...234, 235, etc. 