Math Dictionary 2-3 - Creative Mathematics

Math Dictionary Terms for Grades 2-3:AAcute - an angle less than 90˚Addend - one of the numbers being added in an addition problemAddition - combining quantitiesAlgebra - a strand of mathematics in which variables are used to express rules aboutnumbers and relationshipsAlgorithm - a step-by-step procedure for math operationsAnd - 1) combine, 2) shared attributes, 3) represents decimal point when a number isin wordsAngle - two line segments that meet at a pointArea - the size of a two-dimensional figure in square unitsArray - a rectangular arrangement of objects with equal amounts in each rowAttribute - a characteristic of a shape or set of dataAverage - a number that best describes a set of dataAxis - one of the reference lines on a coordinate graphBBalance - 1) a scale uses to figure out approximate weight, or 2) to be equal or tomake equalBar Graph - a way of organizing data in horizontal or vertical barsBase - the face on which a three-dimensional object sitsBeneath - in a lower placeBetween - in a position that separates two other thingsBi - prefix meaning twoBorrowing - see subtractionCCalculate - to perform a mathematical operation (+, -, x, divide sign)Calendar - a tool to keep track of the dateCartesian plane - coordinate gridCenter - middle pointCentimeter - a metric measure which takes 10 millimeters to makeCentury - 100 yearsCircle - a perfectly round shape that has all points equally as far from the centerCircumference - the perimeter of a circleCoins - metal moneyClockwise - turning in the direction a clock turns - to the rightColumn - a vertical listCommutative Property - the sum or product stays the same when the order ofaddends/factors changesComposite Number - a number that has more than two factorsCompute - to figure out an answerCone - a three-dimensional shape with a circle base and one vertexCongruent - having exactly the same shape and sizeCoordinates - an ordered pair of numbers that gives the location of a point on a coor-

dinate gridCorner - where two sides or two lines come together (vertex)Count - to say numbers one by one in orderCounterclockwise - turning in the opposite direction a clock turns - to the leftCube - a three-dimensional shape with six square facesCurve - a line that is not straight, but does not have a corner (vertex)Cylinder - a three-dimensional shape with parallel circular basesDData - informationDecagon - ten-sided polygonDecimal - a fractional number less than one whole written with a decimal pointDecimeter - one-tenth of a meter, equal to 10 centimetersDenominator - the bottom number in a fraction which tells the number of pieces makingup a wholeDiagonal - a line segment that connects one vertex to another on a polygon, but is noton the perimeter of the polygonDiameter - a line segment that goes through the center of a circleDifference - the amount that remains when one quantity is subtracted from anotherDigit - any one of the symbols used in making numbers (0, 1, 2, 3, 4, 5, 6, 7, 8, 9)Digital Root - adding digits in a number until only one digit remainsDimension - the number of measures needed to describe a geometric figureDistance - a measure of length giving how far things are apartDivision - the operation which makes equal groupsDivisor - the amount by which another quantity is to be dividedDodecagon - twelve-sided polygonDouble - twice as muchEEach - every one of a groupEdge - a line that connects two faces on a three-dimensional shapeEqual - having the same value asEquilateral Triangle - a triangle with all sides having the same lengthEquation - a math sentence showing two parts as equalEquivalent - having the same valueEstimate - an approximate answerEven - a number that is a multiple of 2. It has a 0, 1, 2, 4, 6, or 8 in the one’s placeExpanded Form - a number that is stretched out to show all the place value partsFFace - a side on a three-dimensional shapeFact - something proven to be trueFact Families - a group of addition/subtraction or multiplication/division facts that usethe same set of numbers in various combinationsFactor - a number that is multiplied by another numberFewer - less thanFlip - reflection rotationFoot - 12 inches in standard measurementFormula - an equation or rule that shows a relationship between two or more numbers

Fraction - a number showing part of a wholeFrequency - how often something happens in a set of data or within a certain timeFunction - gives one output value for each input valueGGallon - a standard measure of liquid equal to 128 ounces or 4 quartsGeometry - a strand of mathematics dealing with figures and their partsGoogal - a number which has a 1 followed by 100 zerosGram - a metric measure of weight/mass smaller in weight than an ounceGraph - a visual display of dataGreater Than - more thanGrid - a set of horizontal and vertical lines which form squaresGrowth Pattern - a type of pattern made by following a certain rule (formula)HHalf - one of two equal partsHeight - the distance from the base to the top of somethingHemisphere - half of the earthHeptagon - seven-sided polygonHexagon - six-sided polygonHorizontal - a line parallel to the horizonHour - a measure of time equaling 60 minutesIImperial Measure - standard form of measurement including inches, pounds, etc.Inch - a standard measure of length, one-twelfth of a footInfinity - never endingInteger - whole numbers and their negative partners (1 and -1)Intersection - the elements that belong to both sets in overlapping setsIsosceles Triangle - a triangle with two sides that are the same lengthJJunction - any place where two or more things join to meetKKilo - one thousandKilogram - a metric measure of weight/mass equal to 1,000 grams (just over 2pounds)Kilometer - a metric measure of length equal to 1,000 meters (over 3200 feet)LLatitude - the distance north and south of the equatorLeast - smallestLength - the distance along a line or figure from one point to anotherLess Than - fewer thanLine - a straight path that extends forever in both directionsLine of Symmetry - a line that divides a shape into two halves that are a mirrorimage of each otherLine Segment - a straight path from one point to another

Linear - having to do with linesLiter - a metric measure of volume/capacity almost equal to a quartLongitude - the distance east and west of the equatorMMass - how much matter is in an objectMaximum - greatest amountMean - a way to average a group without extremes in the data in which all data isadded and equally divided upMeasure - the length, quantity, dimensions, or capacity of somethingMedian - a way to average counts or measures when they are extremes in the data.The middle point of the ordered group of data is foundMetric - a system of measurement based on tensMillion - a large number equal to one thousand 1,000sMinimum - least amountMinute - a measure of time equal to 60 secondsMode - a way to average data when there are many identical data points. The mode isthe data that occurs most oftenMoney - coins and paper bills used for buying and sellingMore Than - greater thanMultiple - the product of any two whole numbersMultiplication - the operation of adding the same number over and over or groupsshown in an arrayNNegative Numbers - numbers less than zeroNet - a two-dimensional figure that can be folded to make a three-dimensional modelNetwork - connection between points or line segmentsNonagon - nine-sided polygonNone - not even oneNumber - symbols used for counting and measuringNumberline - a picture (diagram) showing numbers as points on a lineNumeral - digits used to make up numbersNumerator - the top number in a fraction which tells the number of parts selectedOOblong - a shape that is greater in length than in widthObtuse Angle - an angle greater than 90˚Octagon - eight-sided polygonOdd - a number that is not a multiple of 2. It has a 1, 3,5, 7, or 9 in the one’s placeOunce - a standard measure of weight/massOutcome - one of the possibilities in a probability experimentOval - a curved shape like an eggPParallel - straight lines that always stay the same distance away from each otherParallelogram - a four-sided polygon with two sets of parallel sidesPatterns - a repeating sequence of number or shapesPentagon - five-sided polygon

Percent - a number compared to part of 100 using a % signPerimeter - distance around the outside edge of a closed figurePerpendicular- two lines that form a right angle where they intersectPictograph - a visual display of data which uses pictures to represent amountsPi - the comparison of the diameter of a circle to its circumference (about 3.14)Place Value - the value of each digit in a numberPoint - a location (dot) that has no length, width or heightPolygon - a closed two-dimensional figure made with straight line segments which joinonly at endpointsPosition - the place something holds in spacePossible - has a chance of happeningPrime Number - a number with only two factors: 1 and itselfProbability - the strand of math looking at the chance of events occurringProduct - the answer to a multiplication problemProtractor - a math tool for measuring and drawing anglesPyramid - a three-dimensional figure with a polygon base and all other faces are triangleswhich met at a common vertexQQuadrilateral - four-sided polygonQualify - to describe the characteristics of somethingQuantity - an amountQuart - a standard unit of liquid measure that is equal to 4 cupsQuarter - 1) a coin with a value of $.25, 2) one-fourth of somethingQuotient - the answer to a division problemRRadius - a line segment from the center of a circle to the edgeRandom - by chanceRange - the least to greatest value in a set of dataRatio - comparing two numbers using divisionRectangle - a parallelogram with four right anglesReflection - creating a mirror image of a shape by flipping it overRemainder - the amount left over when you have divided as far as possible. Must besmaller than the divisorReoccurring - happening repeatedlyRhombus - a parallelogram with all sides equal in lengthRight Angle - a 90˚ angleRotation - turning a shape around on a vertexRounding - determining an approximate value of a number to a given place valueRow - a horizontal listRule - words that describe a relationship between numbers or objectsRuler - a measuring tool used to determine lengthSScale - a measuring tool used to determine weightScalene - a triangle with three sides, each a different lengthSecond - 1) number two in order, or 2) a measure of time equal to 1/60 th of a minuteSemicircle - half of a circle

Septagon - seven-sided polygonSet - a collection of data with something in commonShape - something having a specific formSide - a line segment that forms part of a polygonSimilar - having the same shape, but not the same sizeSort - to put together things that are in some way alikeSphere - a perfectly round three-dimensional geometric solidSquare - a parallelogram with four congruent sides and four right anglesSquare Number - numbers that can be shown in a square arrayStraight - unbendingSubtraction - the operation of finding the difference between two numbers or takingawaySum - the answer in an addition problemSurface - the outside partSymbol - something that stands for something elseSymmetry - showing an exact duplicate of a shape on an opposite side of a line (lineof symmetry) or around a central point (point symmetry)TTable - an orderly arrangement of dataTake Away - the process of subtractionTally - marks used to keep track of an amountTemperature - amount of heat or cold, measured by a thermometerTesselate - to arrange an area in a repeating geometric patternTile - see tesselateTime - the way we measure years, days, minutesTotal - the whole amountTranslation - sliding a geometric shape a certain distance in the same directionTrapezoid - a quadrilateral with only one set of parallel sidesTriangle - a three-sided polygonUUndecagon - an 11-sided polygonUneven - not evenUniform - the sameUnit - a fixed amount in measurementVValue - how much something is worthVariable - a letter or symbol that stands for another numberVenn Diagram - a drawing with circles that shows relationships between sets of dataVertex - the place where two or more line segments come togetherVertical - a line that is perpendicular to the horizonVolume - the number of cubic units it takes to fill a three-dimensional shapeWWeek - a set of seven consecutive daysWeight - a measure of the heaviness of an objectWhole Number - all counting numbers including zero

Width - a measure of the distance of an object from side to sideXx-axis - the horizontal axis on a coordinate gridYYard - a standard unit of measure equal to 3 feety-axis - the vertical axis on a coordinate gridYear - a length of time equal to 365 daysZZero - a number with no valueZillion - a large number equal to a thousand millions