Glossary Entries

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 e.g. This abbreviation means "for example." When used in the Core, e.g. is not limited to the examples given. Edge A line segment where two faces of a three-dimensional figure meet. Elapsed Time The difference between two times. The amount of time that has passed. Ellipse A squished circle (put simply). If you took a regular circle and only changed the height or width, you would get an ellipse. Endpoint A point at either end of a line segment, arc, or the beginning point of a ray. Equal To A symbol that means two things have the same amount, size, number, or value. ( = ) Equation A mathematical sentence stating that two expressions are equal. Equidistant Having equal distances. Equilateral Having equal sides. Equilateral Triangle A triangle with all sides the same length. Equivalent Equal in value. Examples: 2.9 is equivalent to 2.90 (equivalent decimals), 1 yard is equivalent to 3 feetThe ratio of the value of one currency in relation to the value of another. Exchange Rate Table A table displaying the ratios of the values of several currencies in relation to each other. Expanded Form The expanded form of an algebraic expression is the equivalent expression without parentheses. For example, the expanded form of ( a + b )2 is a2 + 2ab + b2 . A way to write numbers that shows the place value of each digit. 263 = 200 + 60 + 3 or 263 is 2 hundreds, 60 tens, and 3 ones. Expanded Notation Showing place value by multiplying each digit in a number by the appropriate power of 10. For example, 523 = 5 x 100 + 2 x 10 + 3 x 1 or 5 x 102 + 2 x 101 + 3 x 100. Expectation The degree of probability of an occurrence based on probability, what would be expected to happen. Expected Value An average value found by multiplying the value of each possible outcome by its probability, then summing all the products. Experiment An action or process carried out under controlled conditions in order to discover an unknown effect or law, to test or establish a hypothesis, or to illustrate a known law. Experimental Probability Probability based on experimental data; the ratio of the total number of times the favorable outcomes happens to the total number of times the experiment is done found by repeating the experiment several times, given by the formula P(E)=Number of successful outcomes / total number of outcomes. Explain (See justify) Explore To look for patterns or relationships between elements within a given setting. Exponent A number that represents the power. How many times you multiply a number by itself. An exponent may be any real number. Example: For 215, 15 is the exponent, 2 is the base, and 215 is a power of 2. Exponential Form A number written using exponents (e.g., 32=25). Exponential Function A function used to study growth and decay. It has the form y = abx + c with a positive. "b" is not equal to 1. Exponential Notation A symbolic way of showing how many times a number or variable is used as a factor. In the notation 53, the exponent 3 shows that 5 is a factor used three times; that is 53 = 5 x 5 x 5 =125. Expression A variable or combination of variables, numbers, and operation symbols that represents a mathematical relationship. 6, 2 + 3, x, x + 4, and x + 2y are all expressions . Extend A Pattern To continue a pattern through several cycles. Extremes The first and last terms in the ratios of a proportion. Example: 4/10=16/40. 4 and 40 are the extremes. Exterior Angle of a Polygon An angle formed by one side of a polygon and the extension of the adjacent side.

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