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 TOPICS This page:   definitions    Search   Dr. Math See also the Internet Library:   dictionaries MIDDLE SCHOOL About Math Algebra    equations    factoring expressions    graphing equations Arithmetic    division    exponents    factorials    factoring numbers    fractions/percents    logarithms Definitions Geometry    2-dimensional      conic sections/        circles      triangles/polygons    3D and higher      polyhedra History/Biography Logic Measurement    calendars/      dates/time    temperature    terms/units Number Sense    factoring numbers    negative numbers    pi    prime numbers    square roots Probability Puzzles Ratio/Proportion Statistics Word Problems Browse Middle School Definitions Stars indicate particularly interesting answers or good places to begin browsing. What is Dimensional Analysis? [11/26/2001] What is dimensional analysis and how does it work? What is Length in a Rectangle? [05/31/1999] Is the length of a rectangle the longest side, whether vertical or horizontal? What is Math? [10/04/1997] Is math a science, an art, or some other anomaly? What is "Relatively Prime"? [8/3/1996] What does it mean when something is relatively prime? What is the Difference between a Metric and a Standard Ton? [3/28/1995] A student has a question about units of weight. What Skew Lines Are and Aren't [01/14/2004] A description of skew lines including diagrams and definitions. When is the expression Q.E.D. used? [02/15/1999] More on Q.E.D. 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 Cubed? [11/27/2001] Why do we use "cubed" for the volume of a figure? 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 Do We Have Leap Year ? [02/25/1998] Why do we need to have one extra day each 4 years? Why Is a Circle 360 Degrees? [07/01/1998] Why is a circle defined as 360 degrees? Why is K Used as an Abbreviation for Area? [11/29/2004] Many textbooks use the letter K to represent area in formulas, instead of A. Do you know why that is? Why Isn't a Kilobyte 1,000 Bytes? [03/29/2001] If the prefix kilo- means 1000, why is a kilobyte 1024 bytes instead of 1000 bytes? 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.? Why Use Q and Z? [09/12/2001] Why is the letter Q used for rational numbers and Z for integers? Why Y Rises and X Runs [12/19/2012] A teacher seeks an explanation for why slope is "rise over run" rather than "run over rise." Doctor Peterson reveals the logic, as well as a way to investigate these kinds of imponderables, before affirming her derivation from slope-intercept form and suggesting related motivations from other applications. Wondrous Numbers [02/07/2001] What is a wondrous number? 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? Zero and One, Each Unique in Its Own Special Way [04/10/2013] Zero is neither positive nor negative; 1 is neither prime nor composite. So how do we classify these numbers? Page: [

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