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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. Simple Closed Curve [05/22/2001] Why is a simple closed curve called just that? Square Numbers [07/27/1999] Can you explain what a square number is? Story Problems: Real, Realistic, Theoretical [10/24/2002] I am trying to get the definitions for theoretical, realistic, and real problems to be able to determine different types of story problems. Subtrahend and Minuend [03/10/1997] What are subtrahend and minuend? I think they have to do with subtraction. Symmetry [04/29/2001] What is symmetry? Telling Time: A.M. and P.M. [10/30/2001] What do A.M. and P.M. mean? Three IS Greater Than Two? [10/21/2002] Should we say '3 greater than 2' or '3 IS greater than 2'? Trilogy, Tetralogy... [05/28/2003] Why isn't there a numbering system for groups like trilogies? Truncating [01/19/2002] What does truncating mean? Types of Triangles [02/24/2003] What is the the difference between equilateral, isosceles, and scalene triangles? How can I remember which name goes with which triangle? Use and Meaning of 'And' in Naming Decimals [12/01/2004] Can you please tell me what the word "and" means in the word form of a decimal number? Vertical Angle [11/15/2001] What are vertical angles? Are they equal? What Does a Twofold Increase Mean? [01/23/2004] Is a twofold increase simply twice the amount? What about a threefold increase? I'm not used to this terminology of using 'fold.' Does it refer to powers or multiples? What is a Multiple? [12/4/1995] What is the definition of a multiple? What is a Parenthesis? [07/17/2000] What does the mathematical term "parenthesis" mean? What is a Set? [04/04/1997] What is the correct term to refer to groups of objects like 3 cars, 7 pencils, or 5 apples? What is a Sign? [04/21/2003] Can you do anything in math without signs? What is a Significant Digit? [12/25/2001] I came across a question asking for an answer with no more than "2 significant digits" - can you please explain what a significant digit is? What is a tessellation? [01/20/1997] Can you give an example? What is a Torus? [11/30/1999] Is there a good way to describe a torus to a child? What is a Vertex? [12/06/2001] And what does vertices mean? What is Circumference? [06/25/2001] My friend told me it's somewhat like the measurement of the outside of a circle, but I don't understand that. What is Length in a Rectangle? [05/31/1999] Is the length of a rectangle the longest side, whether vertical or horizontal? What is the Plural of Rhombus? [4/7/1995] Hi! Say, what exactly is the plural of "rhombus?" We aren't sure if it is "rhombi" or "rhombuses". Who Invented the Square Root? [12/11/1996] I've only seen long, stringy roots! Whole Numbers and Multiples [09/11/2001] My students and I have been trying to figure out what numbers are in the set of "Whole Numbers." Is zero a whole number? Why Does 1 Degree Equal 60 Minutes? [07/28/2004] In 60 minutes, the minute hand of a clock makes a full circle, which is 360 degrees. How can 60 minutes equal 1 degree when measuring angles? Why Is a Circle 360 Degrees? [07/01/1998] Why is a circle defined as 360 degrees? Why Is 'Pound' Abbreviated 'lb'? [03/08/2004] Why is "pound" abbreviated lb? Is it because of its Latin roots? I know libra means pound. What is the history of it? Why is the Word "Number" Abbreviated to "No."? [05/13/2002] Why is the word number abbreviated to no.? Word for a 225th Birthday [07/10/2001] This year America is celebrating its 225th birthday. As we celebrated the bicentennial in 1976, is there a term for 225 years? Writing Numbers with Hyphens [06/04/2003] Why do we hyphenate one hundred-millionth, but we don't hyphenate one hundred million? Page: [

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