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5th Grade: 5th Grade Word List  Math (List 1) 
algebraic expression


an expression built up from constants, variables, and a finite number of algebraic operations 
angle


the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians 
array


an orderly arrangement; an impressive display; an arrangement of aerials spaced to give desired directional characteristics 
customary system


the system of weights and measures based on the foot and pound and second and pint that dates back to colonial America but differs in some respects from the British Imperial System 
customary unit


a set of units which can be used to specify anything which can be measured and were historically important, regulated and defined because of trade and internal commerce 
least common multiple


the smallest multiple that is exactly divisible by every member of a set of numbers 
metric system


a decimal system of weights and measures based on the meter and the kilogram and the second 
metric unit


a decimal unit of measurement of the metric system (based on meters and kilograms and seconds) 
ordered pair


two numbers written in a certain order, usually written in parentheses like this: (4,5) 
prime


first in excellence, quality, or value; at the best stage; peak; first in degree or rank; chief 
rate


a quantity or amount or measure considered as a proportion of another quantity or amount or measure 
standard form


scientific notation, where a number is written in two parts: 1)digits with the decimal point placed after the first digit, 2) X10 to a power 
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