Dictionary
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 natural numbers
 One of the counting numbers, i.e. 1, 2, 3, 4...
In graphing, numbers to the right of zero (cf
Integer Discussion).
 negative numbers
 Numbers less than zero. In graphing, numbers to the left of zero. Negative numbers
are represented by placing a minus sign () in front of the number (cf From Graphs to Machines and Back Discussion).
 normal distribution
 Also called "bell curve," the normal distribution is the curved shape of
a graph that is highest in the middle and lowest on the sides (cf The Normal Distribution Discussion).
 numerator
 The number above the fraction bar that indicates the
number of parts of the whole there are in a rational number.(cfFractions
Discussion, Adding and
Subtracting Fractions Discussion, Multiplying
and Dividing Fractions Discussion, Comparing Fractions
Discussion, Percents
Discussions).
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