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Definitions - 7th Grade

AB
SumThe answer to an addition problem.
DifferenceThe answer to a subtraction problem.
ProductThe answer to a multiplication problem.
QuotientThe answer to a division problem.
Operations+ , - , x , /
Natural Numbers{ 1,2,3...}
Whole Numbers{0,1,2,3...}
Integers{-2,-1,0,1,2}
Rational NumbersAny number that can be expressed in a/b form, b is not equal to 0..
Irrational NumbersAny number that can not be expressed in a/b form.
Absolute ValueThe distance from any number to zero on a number line.
PEMDASOrder of Operations
Algerbraic ExpressionConsists of numbers, variables, and an operation.
Numberical ExpressionConsists of numbers and operations.
Commutative PropertyOrder of adding or multiplying numbers doesn't change the answer.
Associative PropertyGrouping numbers differently in addition and multiplication doesn't change the answer.
Distributive PropertyThe product of a number and the sum of two numbers is equal to the product of the two numbers.
Identity Element of AdditionAdding 0 to any number doesn't change the value of that number.
Identity Element of MultiplicationMultiplying any number by 1 doesn't change the value of that number.
Multiplication by ZeroMultiplying any number by zero will result in an answer of zero.
Multiplicative InverseMultiplying any number by its reciprocal will result in an answer of 1.
Additive InverseAdding any number to its opposite will result in an answer of 0.
Commutative Property Example5 x 7 = 7 x 5
Associative Property Example(3 + 2) +5 = 3 + (2 + 5)
Distibutive Property Example4 ( 6 + 5 ) = 24 + 20
Identity Element of Addition Example9 + 0 = 9
Identity Element of Multiplicaton Example8 * 1 = 8
Multiplication by Zero Example7 * 0 = 0
Multiplicative Inverse Example4/5 x 5/4 = 1
Additive Inverse Example2 + - 2 = 0
VariableA letter that represents a number.
EquationA math sentence with an operation and an equal sign.
InequalityA math sentence using the symbols < , >
EvaluateTo solve
Base 1The bottom of a figure
Base 2A number raised to an exponent.
Area of a parallelogrambh
Area of a triangle1/2 bh
Area of a trapezoid1/2 h (a+b)
Quadrilateral4 sided polygon
PolygonA closed figure with 3 or more sides
ParallelogramA quadrilateral with 2 pair of parallel sides
TrapezoidA quadrilateral with 1 pair of parallel sides
RhombusA parallelogram with 4 congruent sides
SquareA parallelogram with 4 right angles and 4 congruent sides
RectangleA parallelogram with 4 right angles
PentagonA 5 sided polygon
HexagonA 6 sided polygon
HeptagonA 7 sided polygon
OctagonAn 8 sided polygon
NonagonA 9 sided polygon
DecagonA 10 sided polygon
CircumferenceThe distance around the circle
RadiusDistance from the center to the edge of a circle
DiameterThe distance from one side of a circle to the other, passing through the center
Acute AngleAn angle whose measure is less than 90 degrees
Right AngleAn angle whose measure is 90 degrees
Obtuse AngleAn angle whose measure is more than 90 degrees but less than 180 degrees
Straight AngleAn angle whose measure is 180 degrees
Complementary AnglesAngles whose sum equal 90 degrees
Supplementary AnglesAngles whose sum equal 180 degrees
Alternate Exterior AnglesExterior angles on the opposite side of the transversal
Alternate Interior AnglesInterior Angles on the opposite side of the transversal
Parallel LinesLines that will never intersect
Perpendicular LinesLines that intersect and form a right angle
Prime NumbersA whole number whose factors are 1 and itself
Composite NumbersNatural numbers that have 3 or more factors
Perfect SquareA rational number whose roots are a whole numbers
Square RootOne of 2 equal factors of a number


Dominique Mutone

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