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 TOPICS This page:   definitions    Search   Dr. Math See also the Internet Library:   dictionaries ELEMENTARY Arithmetic    addition    subtraction    multiplication    division    fractions/decimals Definitions Geometry    2-dimensional      circles      triangles/polygons    3D and higher      polyhedra Golden Ratio/ Fibonacci Sequence History/Biography Measurement    calendars/      dates/time    temperature    terms/units Number Sense/ About Numbers    infinity    large numbers    place value    prime numbers    square roots Projects Puzzles Word Problems Browse Elementary School Definitions Stars indicate particularly interesting answers or good places to begin browsing. Selected answers to common questions:     Meters squared or square meters?     Greater than, less than symbols. Moving the Decimal Point [12/04/2002] When you divide two decimals, what is it called when you move the decimal point? Multiplier, Sum, Difference, Product, Quotient, Dividend [11/25/1997] What is a multiplier? an addend? a minuend? a product? Why is the number that is being divided the "dividend"? Name of Bar That Denotes a Repeating Decimal [08/30/2004] What is the name of the bar that goes over a digit or group of digits that signifies that the digit or group repeats? Name of Division Symbol [7/31/1996] What is the official name for the division symbol? Naming Nine Things [01/15/2003] What is the correct name for nine things collectively? I can only find the answer up to 7, septuplet, which has been highly publicized with the McCoy babies. Nautical Mph/Knots [08/12/2003] I want to know how fast the wind is blowing when the weather report states 5 knots. Nonagon or Enneagon? [02/06/2003] Is 'enneagon' really the correct name for a 9-sided polygon? Numbers and Digits [09/21/2000] What is a digit? Why can't we call a digit a number? Numbers and Numerals [09/06/1997] What's the difference between a number and a numeral? Numbers and Numerals [08/29/2002] 15/5 and sqrt(9) both reduce to 3, but is it proper to say that they are integers? Numbers: Cardinal, Ordinal, Nominal? [10/25/1999] Which group of numbers - cardinal, ordinal or nominal - does "time" fit into? Are there other types of numbers as well? Number Word Etymologies [05/03/2001] Who made up the names for numbers? Obtuse angles [11/10/1994] What is an obtuse angle? One Dimension [05/13/2003] Is there such a thing as 1D? On-line Mathematics Dictionary [2/18/1996] I am a 2nd grade teacher in California, and need the list of mathematical terms I've seen somewhere recently. Origin of the Null Symbol [03/05/2003] Where did the null symbol come from? Origin of the Term "Improper" Fraction [07/28/2006] Why are fractions with larger numerators than denominators called "improper"? Where did the terms "proper" and "improper" originate in relation to fractions? Origins of Celsius and Fahrenheit [03/31/2002] Who invented Celsius and Fahrenheit? Parts of a Subtraction Problem [04/09/2001] What are the numbers 4 and 1 called in the subtraction 4 - 1 = 3? A Peck of Peppers [02/27/2002] If Peter Piper picked a peck of pickled peppers, how many pickled peppers did Peter Piper pick? How much is a peck? Pentagram [12/08/2001] Is a five-pointed star on a flag a decagon? Or just five triangles? Percent or Percentage? [05/14/2002] Would you please explain the exact difference between the words percent and percentage? Perfect Numbers [08/14/1997] What is the highest perfect number that has been found? How many perfect numbers are there? What are they? Perfect Square: Definition [10/24/1999] What is a perfect square? Perimeter of an Oval [04/08/1999] What is the perimeter of an oval called? Polygon Names [09/18/2001] Why is a 3-sided polygon called a triangle instead of a tri-gon? Why is a 4-sided polygon called a quadrilateral instead of a tetragon, when all the others are ___-gons? Why is there not a single consistent term? Polyominos [08/11/1999] What is the definition of a polyomino? The Pound Sign [04/06/2001] Can the # symbol be used to represent the weight unit 'pounds'? Prime Numbers [01/31/1997] What are the prime numbers and why are they prime numbers? Prime Numbers vs. Prime Factors [01/13/1997] What is the difference between a prime number and a prime factor? Pyramid Corners [05/01/2001] How many corners does a pyramid have? Is a corner the same thing as a vertex? Quadrant [03/25/2001] What is a quadrant? Quadrilateral Classification: Definition of a Trapezoid [01/15/1997] What is the correct definition of a trapezoid, and why? Quadrilaterals [8/31/1995] What is 4-sided and has no equal angles? Rays and Angles [11/24/1997] Do rays have an arrow on both ends, or is that an angle? Reciprocals [12/19/1996] What is the use of reciprocals? Regular Decagon [03/25/2002] Can you show me a picture of a regular decagon? Rounding to the "Nearer" or "Nearest" Cent? [10/18/2004] Would you ever say "rounded to the nearer cent" instead of "rounded to the nearest cent"? Rules for Significant Figures and Decimal Places [03/23/1999] Accurate measurement: What are significant digits? When do we use them? Why? Significant Digits and Zero [05/19/1999] When are zeros significant and when are they not significant? Page: []

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