TOPICS
This page:
definitions
Search
Dr. Math
See also the
Internet Library:
dictionaries
ELEMENTARY
Arithmetic
addition
subtraction
multiplication
division
fractions/decimals
Definitions
Geometry
2dimensional
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.
 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 9sided 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?
 Online 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 fivepointed 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 3sided polygon called a triangle instead of a trigon? Why is a
4sided 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 4sided 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?
 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?
Page: [<prev]
1
2
3
4
[next>]
