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Expressions Chapters 1 & 2

AB
factorOne of two or more numbers multiplied to find a product.
productThe answer to a multiplication problem.
comparisonA method of showing whether one quantity is greater than, less than, or equal to another quantity.
areaThe amount of surface covered or enclosed by a figure measured in square units.
combinationA selection of members of a set when the order is not important.
equal groupsGroups that have the same number of objects.
arrayAn arrangement of objects, pictures, or numbers in equal columns and equal rows.
functionA relationship between two sets of numbers.
variableA letter or a symbol that represents a number in an algebraic expression.
equationA statement that two expressions are equal.
parenthesesSymbols used to group numbers or variables in an equation or expression.
misleadingLanguage in a comparing sentence that may cause you to do the wrong thing.
commutative propertyThe property that states that changing the oder in which numbers are multiplied does not change the product.
associative propertyThe property that states that changing the grouping of factors does not change their product.
distributive propertyThe property that states that when two addends are multiplied by a factor, the product is the same as when each addend is multiplied by the factor and those products are added.
expressionOne or more numbers, variables, or numbers and variables with one or more operations signs.
exampleA proposed problem, used to prove that a mathematical property or argument applies to a specific case.
counterexampleAn example that proves that a general statement is false.
divisionAn operation that tells how many groups there are and how many are in each group.
quotientThe answer to a division problem.
multipleThe product of a given whole number and any other whole number.
ruleA standard method or procedure for solving a class of problems.
greater thanA number of larger value than another number.
less thanA number of smaller value than another number.
meterThe basic unit of length in the metric system. A meter is a little longer than a yard.
decimeterA metric unit of length equal to one tenth of a meter.
centimeterA metric unit of length equal to one hundredth of a meter.
millimeterA metric unit of length equal to one thousandth of a meter.
perimeterThe dsitance around a figure.
baseThe bottom of a polygon or solid.
heightThe perpendicular distance from a base of a figure to the highest point.
acute angleAn angle that measures less than 90 degrees.
right angleAn angle that measures 90 degrees.
obtuse angleAn angle that measures more than 90 degrees and less than 180 degrees.
parallelogramA quadrilateral in which both pairs of opposite sides are paralle and opposite angles are congruent.
perpendicularLines, line segments, or rays that form right angles where they intersect.
dimensionsA way to describe how a figure can be measured. The height, length, or width.
complex figuresA figure made by combining simple geometric figures like rectangles and triangles.
hexagonA six-sided polygon.
pentagonA polygon with five sides.
right triangleA triangle with one right angle.
acute triangleA triangle in which each of the three angles is acute.
obtuse triangleAn triangle with one angle that measures more than 90 degrees.
equilateral triangleA triangle that has three congruent sides and three congruent angles.
isosceles triangleA triangle with at least two congruent sides.
scalene triangleA triangle with no equal sides.
square unitAn unit of area equal to the area of a square with one-unit sides.
congruentExactly the same size and shape.


7th Grade Math Teacher
Morgan Middle School
Ellensburg, WA

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