natural logarithm: A logarithm that has e as a base.
natural numbers: The counting numbers.
negative number: A real number that is less than zero.
net: A plane figure obtained by opening and flattening a 3-D object.
neutron: A subatomic particle with no net electric charge and a mass slightly larger than that of a proton.
norm: The mean or the average - an established pattern or form.
normal: Perpendicular.
nth root: The  root of a number is the number needed to multiply by itself n times in order to get that number. Example: the  root of 3 is 81 because  .
nucleus: The collection of protons and neutrons in the center of an atom, also composed of subatomic matter.
number line: A line on which every point represents a real number, usually increasing in value from left to right.
numeral: A written symbol referring to a number.
numerator: The top part of a fraction.
numeric: Referring to a number or numbers.
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