Glossary Entries
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| Obtuse Angle | An angle that has a value greater than 90 degrees and less than 180 degrees. |
| Obtuse Triangle | A triangle that contains one obtuse angle. |
| Octagon | A polygon with 8 sides and 8 angles. |
| Odd Number | A number that when divided by two gives a remainder of positive or negative 1. Examples are 1, 3, 5, 7 and 9. It is represented by a number that has 1,3,5,7, or 9 in the ones position. |
| One-Digit Number | A number consisting of just one digit. Examples: 0, 1,2,3,4,5,6,7,8, or 9. |
| Ones Place | The first digit to the left of the decimal point; it shows how many ones are in a number. It is also called the ones position. |
| One-Step Equation | An equation or inequality that can be solved in one step or action. |
| One-to-One Correspondence | The relationship between the spoken word and the written symbol. |
| Open Figure | A figure that is not closed; i.e., it does not start and end at the same point. |
| Open Sentence | A statement that contains at least one unknown. It becomes true or false when a quantity is substituted for the unknown. Example: 4 + n= 5 becomes true when n = 1. |
| Operation | The action in a math problem. An operation can be addition, subtraction, multiplication, or division. Procedures used to combine numbers, expressions, or polynomials into a single result. |
| Opposite | The result of taking a number and changing its sign (e.g., the opposite of 5 is –5, the opposite of –12 is –(–12) or 12; a number and its opposite are equidistant from zero in a number line, but on opposite sides of zero.(See additive inverse) |
| Order | To place numbers or objects in a sequential arrangement (e.g., least to greatest or heaviest to lightest). |
| Order of Operations | A specified sequence in which mathematical operations are expected to be performed. An arithmetic expression is evaluated by following these ordered steps: (1) simplify within grouping symbols such as parentheses or brackets, starting with the innermost; (2) apply exponents - powers and roots; (3) perform all multiplications and divisions in order from left to right; (4) perform all additions and subtractions in order from left to right. |
| Ordered Pair | A set of two numbers named in an order that matters; represented by (x,y) such that the first number, x, represents the x-coordinate and the second number, y, represents the y-coordinate when the ordered pair is graphed on the coordinate plane; each point on the coordinate plane has a unique ordered pair associated with it. |
| Ordinal Number | A whole number that names the position of an object in sequence. First, second, and third are ordinal numbers. |
| Ordinate | The Y coordinate on a Cartesian graph. The Cartesian system is the one that looks like a grid full of squares. |
| Origin | The point on the coordinate plane where the x- and y-axes intersect; has coordinates (0,0). |
| Ounce | A customary unit used to measure mass; 1 ounce = 1/16 pound; 16 ounces = 1 pound. The abbreviation for ounce is "oz." |
| Outcome | One of the possible events in a probability experiment (e.g., when tossing a fair coin there are two possible outcomes, heads or tails). |
| Outlier | A number in a set of data that is much larger or smaller than most of the other numbers in the set. Example: In the data set {3, 5, 4, 4, 6, 2, 25, 5, 6, 2} the value of 25 is an outlier. |
Useful Reference Materials
Wikipedia:https://en.wikipedia.org/wiki/Fraction_%28mathematics%29
Encyclopædia Britannica:
http://www.britannica.com/topic/fraction
University of Delaware:
https://sites.google.com/a/udel.edu/fractions/
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