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Math Words for Grades 3-5

Key math vocabulary for multiplication, fractions, decimals, geometry and data.

77 cardsGrades 3–5#vocabulary#elementary

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77 cards
  • FactorWord
    A number that multiplies with another to make a product3 and 4 are factors of 12
  • ProductWord
    The answer to a multiplication problem
  • QuotientWord
    The answer to a division problem
  • DividendWord
    The number being dividedIn 12 ÷ 3, it is 12
  • DivisorWord
    The number you divide byIn 12 ÷ 3, it is 3
  • RemainderWord
    What is left over after dividing
  • MultipleWord
    What you get when you multiply a number by 1, 2, 3, ...Multiples of 5: 5, 10, 15
  • Prime numberWord
    A number greater than 1 with exactly two factors, 1 and itself
  • Composite numberWord
    A number with more than two factors
  • ArrayWord
    Objects arranged in equal rows and columns
  • EquationWord
    A math sentence with an equals sign
  • ExpressionWord
    Numbers and operation signs with no equals sign3 × 4 + 2
  • VariableWord
    A letter that stands for an unknown number
  • NumeratorWord
    The top number in a fraction; how many parts we have
  • DenominatorWord
    The bottom number in a fraction; how many equal parts in the whole
  • Equivalent fractionsWord
    Fractions that name the same amount1/2 and 2/4
  • Mixed numberWord
    A whole number and a fraction together2 1/3
  • Improper fractionWord
    A fraction whose numerator is greater than or equal to its denominator7/4
  • Unit fractionWord
    A fraction with 1 on top1/5
  • Simplest formWord
    A fraction that cannot be made smaller; the top and bottom share no factor but 1
  • DecimalWord
    A number written with a decimal point to show parts of a whole0.75
  • Decimal pointWord
    The dot that separates ones from tenths
  • TenthsWord
    The first place right of the decimal point
  • HundredthsWord
    The second place right of the decimal point
  • RoundWord
    Replace a number with a nearby number that is easier to use
  • EstimateWord
    Find an answer that is close but not exact
  • RegroupWord
    Trade between place values, such as 10 ones for 1 ten
  • Place valueWord
    The value of a digit based on where it sits in a number
  • PerimeterWord
    The distance around a shape
  • AreaWord
    The amount of flat space inside a shape, in square units
  • VolumeWord
    The amount of space inside a solid, in cubic units
  • CapacityWord
    How much a container can hold
  • AngleWord
    Formed where two rays meet at a point
  • Right angleWord
    An angle of exactly 90 degrees, like a square corner
  • Acute angleWord
    An angle less than 90 degrees
  • Obtuse angleWord
    An angle greater than 90 degrees and less than 180 degrees
  • Straight angleWord
    An angle of exactly 180 degrees
  • Parallel linesWord
    Lines that stay the same distance apart and never meet
  • Perpendicular linesWord
    Lines that meet at a right angle
  • Intersecting linesWord
    Lines that cross each other
  • Line segmentWord
    Part of a line with two endpoints
  • RayWord
    Part of a line with one endpoint that goes on forever in one direction
  • PointWord
    An exact location with no size
  • PolygonWord
    A closed flat shape made of straight sides
  • QuadrilateralWord
    Any polygon with 4 sides
  • PentagonWord
    A polygon with 5 sides
  • HexagonWord
    A polygon with 6 sides
  • OctagonWord
    A polygon with 8 sides
  • SymmetryWord
    When a shape can be folded so both halves match exactly
  • Line of symmetryWord
    The fold line that makes two matching halves
  • CongruentWord
    Exactly the same size and shape
  • FaceWord
    A flat surface of a solid shape
  • EdgeWord
    Where two faces of a solid meet
  • VertexWord
    A corner point of a shape or solid; plural is vertices
  • Elapsed timeWord
    The amount of time that passes from start to end
  • DataWord
    Facts or numbers collected to learn something
  • Bar graphWord
    A graph that uses bars to compare amounts
  • Line plotWord
    A number line with marks above it to show how often values occur
  • PictographWord
    A graph that uses pictures to show data
  • SurveyWord
    Asking a group of people questions to collect data
  • MeanWord
    The average: add all values and divide by how many there are
  • MedianWord
    The middle value when the data are in order
  • ModeWord
    The value that appears most often
  • RangeWord
    The highest value minus the lowest value
  • Commutative propertyWord
    You can swap the order of numbers when adding or multiplying3 × 4 = 4 × 3
  • Associative propertyWord
    You can regroup numbers when adding or multiplying and get the same answer
  • Distributive propertyWord
    Multiplying a sum equals multiplying each part and adding3 × (4 + 2) = 3 × 4 + 3 × 2
  • Identity propertyWord
    Adding 0 or multiplying by 1 leaves a number unchanged
  • Inverse operationsWord
    Operations that undo each otherAddition and subtraction
  • Ordered pairWord
    Two numbers in parentheses that name a point on a grid(3, 5)
  • Coordinate planeWord
    A flat grid made by a horizontal and a vertical number line
  • DigitWord
    One of the symbols 0 to 9
  • Compatible numbersWord
    Numbers that are easy to compute with in your head
  • UnitWord
    A fixed amount used to measure, like an inch or a gram
  • WeightWord
    How heavy something is
  • MassWord
    The amount of matter in an object
  • FractionWord
    A number that names equal parts of a whole

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