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Browse Middle School Definitions
Stars indicate particularly interesting answers or
good places to begin browsing.
 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 slopeintercept 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?
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