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- 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
- 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?
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