## Tuesday, November 16, 2010

### Arithmetical words, Part III

This is day three of the Great Arithmetic Glossary Series, where I am trying to create the most concise definitions possible for elementary math words and concepts.

These definitions are estimates; I am rounding the meanings slightly in order to save space and words. It would be possible to carry out the definitions to many significant digits!
• Leap Year 366-day year created by adding an extra day (29th) in February; helps compensates for uneven motion of the Earth around the sun
• Least Common Factor smallest factor of two or more numbers
• Least to Greatest arrangement of numbers from lowest value to highest value
• Length distance along a figure’s longest side from one end point to the other
• Less Than number of smaller, or lesser, value than another number; symbol <
• Likely Event event with a probability of greater than 0.5 but not certain or equal to 1.0
• Line 2D straight path extending infinitely in both directions without any endpoints
• Line Graph diagram where plotted data points form a line that (usually) shows change over time
• Line of Symmetry line that divides a figure so each portion is a mirror image of the other
• Line Segment portion of a line that has two endpoints
• Lowest Common Multiple the multiple of two or more numbers that has the least value
• Mean description of a set of values calculated by adding the values and dividing their sum by the number of items in the set; Average
• Median description of a set of values obtained by putting the values in order from least to greatest and selecting the middle value (for an odd number of items) or by calculating the mean of the two middle values (for an even number of items)
• Mode description of a set of values obtained by selecting the value within the set that occurs most frequently; a set may have more than one mode
• Month unit of time containing 28-31 days; 1/12th of a year; based on lunar motion around the Earth
• Multiple product of two whole numbers
• Multiplicand factor being multiplied in a multiplication problem
• Multiplier factor by which the multiplicand is multiplied in a multiplication problem
• Negative Number number less than zero
• Numerator portion of a fraction that is written above the line; it represents parts of a whole
• Obtuse Angle angle that measures more than 90 degrees and less than 180 degrees
• Octagon polygon with exactly eight sides
• Odd Number number that cannot be divided into two equal groups; ends in 1, 3, 5, 7 or 9
• Open Figure begins and ends at two different points
• Order of Operations rules used to determine the sequence of performing addition, subtraction, multiplication and division in an equation
• Order of Symmetry number of different positions to which a figure can be rotated to match itself exactly
• Ordered Pair pair of numbers used to locate a point on a coordinate grid; horizontal (x-coordinate) is given first and vertical (y-coordinate) is next
• Ordinal Number whole number that indicates sequential position: first, second, third, etc
• Origin intersection of x- and y-axes on a coordinate grid; designated as a point (0, 0)
• Outlier value in a set that is an extreme deviation from the mean value
Stay tuned for more math words tomorrow!