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+,   Math Dictionary 
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A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z 
C C equals 100 in Roman numerals. 
calculator A calculator is a machine that solves math problems. 
calculus Calculus is a branch of mathematics that was developed separately by Gottfried Wilhelm Leibniz and Isaac Newton in the 1600s. Calculus is used to calculate motion and areas (and many other things). Differentiation and integrations are two major areas of calculus. 
calendar A calendar divides the year into periods and lets you know what day it is. 
cardinal number A cardinal number is a whole number that tells you "How many?". 
Carroll diagram A Carroll diagram (named for the mathematician/author Lewis Carroll) is a rectangular chart that is used to sort items with respect to one, two or three binary (yes/no) categories. 
carry When you carry in addition, the sum of the numbers is ten or more, and the ten's place is "carried" to the next place. 
Cartesian coordinates A Cartesian coordinate system is a rectangular coordinate system with two axes (x is the horizontal axis and y is the vertical axis). Every point on the plane can be located by an ordered pair (x,y), which notes its distance from the xaxis and from the yaxis. The axes meet at the origin, the point (0,0). It is named for René Descartes. 
cent Cent is another word for penny. 
center of mass The center of mass is the location at which the entire mass of an object (or set of objects) may be considered for purposes of calculations. It is the point of the average weighted position in space of an object (or a collection of objects). 
centi Centi is a prefix that means onehundredth. For example, a centimeter is one hundredth of a meter. 
centroid The centroid is the point at which a geometric figure balances. The centroid of a triangle is the point at which the three medians intersect. 
chord A chord is a line segment that connects two points on a circle. The longest chord on a circle is the diameter of the circle. 
circle All of the points on a circle are the same distance from the center of the circle (that distance is called the radius of the circle). 
circle graph A circle graph (also called a pie chart) is a diagram that is useful for displaying information about the percentages or parts of a whole. 
circumference The circumference is the distance around an object. The circumference of a circle of radius r is 2πr . 
clock A clock tells you what time it is. 
coefficient In an expression or equation, a coefficient is a number in front of a variable. For example, in the expression 8x, the coefficient is 8 (and the variable is x). 
coin A coin is a piece of metal money. 
collinear Points that are collinear are on the same line. 
a x b = b x a commutative property The commutative property states that for some operations, you can change the order of the terms and not change the outcome of the operation. For example, a x b = b x a and a + b = b + a. The commutative property holds for addition and multiplication; it does not hold for subtraction or division. 
compass A compass is a device that always points north. A compass is also a device that draws circles. 
compass rose A compass rose is a design on a map that shows direction. It points which way is north, south, east, west, and some intermediate directions on the map. 
compatible numbers Two compatible numbers form a division fact. For example, since 72 divided by 9 is 8, 72 and 9 are compatible numbers (so are 72 and 8). 
complementary angle A complementary angle is an angle that, when added to another angle, equals 90 degrees. 
complex fraction A complex fraction is a fraction that has a fraction in the numerator, denominator, or both. 
complex number A complex number is a number that can be written in the form a + bi, where a and b are real numbers and i is the square root of 1 (an imaginary number ). 
composite number A composite number is a number that has more than two factors. For example, 6 is a composite number because it has four factors (1, 2, 3, 6). 5 is not a composite number because it has only 2 factors, 1 and 5. 
computer You are using a computer right now. 
concentric circles Concentric circles are circles that have the same center point. 
conditional A conditional (also called an ifthen statement or an implication) is a statement of the form, "if p then q"  p is called the antecedent, p is called the consequent. The conditional "if p then q" is false only when p is true and q is false. 
cone A cone is a shape that has a point at the center and a circular crosssection throughout (it looks like two infinitelylong ice cream cones with the vertices touching). The volume of a single portion of a cone is πr^{3}L/3 (where r=radius of cone at the larger end, L=length of the cone). 
congruent Congruent means having the same shape and size. For example, two triangles are congruent if they have the same interior angles and same side length. Two line segments are congruent if they are the same length. 
conic section A conic section is set of points that results from the intersection of a cone and a plane. Some conic sections include a point, ellipse, circle, parabola, and hyperbola. 
conjecture A conjecture is an educated guess. 
connectthedots When you do a connectthedots puzzle, you draw a line from number to number to make a picture. 
consecutive Consecutive means in order. For example, 1 and 2 are consecutive whole numbers; 6 and 8 are consecutive even numbers. 
coordinates Coordinates are an ordered pair of numbers that show the location of a point on the xy plane. Every point on the plane can be located by a pair of coordinates (x,y), which notes its distance from the xaxis and the yaxis. 
cosecant Cosecant (abbreviated csc) is a trigonometric ratio, corresponding to the length of the hypotenuse divided by the length of the opposite side of the right triangle. Cosecant is equal to 1/sine. 
cosine Cosine (abbreviated cos) is a trigonometric ratio, corresponding to the length of the adjacent side divided by the length of the hypotenuse of the right triangle. 
cotangent Cotangent (abbreviated cot) is a trigonometric ratio, corresponding to the length of the adjacent side divided by the length of the opposite side of the right triangle. Cotangent is equal to 1/tangent. 
counting number The counting numbers are the positive whole numbers, 1, 2, 3, 4, 5... . 
crescent A crescent is the shape of the moon shortly before and after the time of the new moon. 
cube A cube is a solid geometric figure with six square faces. The volume of a cube is s^{3} (where s=length of a side of the cube). The surface area of a cube is 6s^{2} (where s=length of a side of the cube). 
cube root The cube root of a number, n, is a number whose cube is that number. For example, the cube root of 8 is 2, since 2 x 2 x 2 = 8. In general, the cube root of n is a if a^{3}=n. 
cubed Cubed means raised to the third power, like x^{3}. For example, 2 cubed = 2 x 2 x 2 = 8. 
cubic equation A cubic equation is an equation whose highest degree term is 3. For example, 5x^{3}  8x^{2} + 2xy = 4 is a cubic equation. 
curve A curve is a wavy line. 
cylinder A cylinder is a 3dimensional figure with a long tubelike body and congruent, parallel bases. A rightcircular cylinder has a base that is perpendicular to the axis of the cylinder (it is like a can of food). The volume of a rightcircular cylinder is πr^{2}L (where L=length of cylinder, r=radius of cylinder). The surface area of a cylinder is 2πrL + 2πr^{2} (where L=length of cylinder, r=radius of cylinder). 
+,   Math Dictionary 
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A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z 
Counting  Addition  Subtraction  Multiplication  Division 
Number Line  Fractions  Decimals  Graphs  Measurement  Rounding 
Click on an underlined word for more information on that subject. If the math term you are looking for is not in the dictionary, please email us.
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