Circle Graph A graph in the shape of a circle that shows data as a whole made up of different partscircle data
Closed Figures A shape that begins and ends at the same point point
Cone A solid, pointed figure that has a flat, round basesolid
Congruent Figures that have the same size and shape These triangles are congruent.
Cube A solid figure with six congruent square facessolid figurecongruentsquare faces
Cumulative Frequency A column in a table that keeps a running total in a frequency tablefrequency table
Cup A customary unit used to measure capacitycustomarycapacity 2 cups = 1 pint
Cylinder A solid figure that is shaped like a cansolid figure
Decimal A number that uses place value and a decimal point to show values less than one, such as tenths and hundredthsplace value decimal pointtenthshundredths 3.47
Decimal point A period used in decimal numbers to separate the whole number part from the decimal partdecimal
Degree A unit of measure used to measure parts of a circle. There are 360° in a circle.
Degree Celsius A standard unit for measuring temperature in the metric system metric system
Degrees Fahrenheit A standard unit for measuring temperature in the customary system customary system
Denominator The number below the bar in a fraction. It tells the total number of equal parts.fraction
Diameter A line segment that passes through the center of a circle and has its endpoints on the circleline segment
Difference The answer in a subtraction problem 8 - 5 = 3 3 is the difference.
Dividend The number that is being divided in a division problem division 35 ÷ 5 = 7 The dividend is 35.
Divisor The number that divides the dividenddividesdividend 18 ÷ 3 = 6 The divisor is 3.
Double bar graph A graph using bars to compare similar kinds of databars
Elapsed time The time that passes from the start of an activity to the end of that activity The elapsed time is one hour.
Equally likely When the outcomes of an experiment have the same chance of happeningexperiment You are equally likely to roll 1, 2, 3, 4, 5, or 6.
Equilateral triangle A triangle with all sides congruenttrianglecongruent
Equivalent decimals Two or more decimals that name the same amountdecimals 0.3 and 0.30 name the same amount.
Equivalent fractions Two or more fractions that name the same amountfractions
Expanded form A way to write numbers by showing the value of each digitdigit 635 = 600 + 30 + 5 1,479 = 1,000 + 400 + 70 + 9
Expression A part of a number sentence that combines numbers and operation signs (12 – 4) – 3
Fact family A set of related addition and subtraction or multiplication and division number sentencesadditionsubtraction multiplicationdivision 2 + 4 = 6 6 - 4 = 2 4 + 2 = 6 6 - 2 = 4 or 3 X 6 = 18 18 ÷ 6 = 3 6 X 3 = 18 18 ÷ 3 = 6
Factor A number that is multiplied by another number to find a product.multipliedproduct 4 4 X 7 = 28 X 7 28 The factors are 4 and 7.
Factor tree A diagram that shows the prime factors of a composite numberprimefactors
Fraction A number that names part of a whole or part of a group
Frequency table A table that organizes the total for each category or group
Gallon A customary unit used to measure capacitycustomarycapacity 4 quarts = 1 gallon
Grouping property of addition The property which states that the way addends are grouped does not change the sumaddendssum (5 + 9) + 3 = 5 + (9 + 3) 14 + 3 = 5 + 12 17 = 17
Grouping property of multiplication The property which states that the way factors are grouped does not change the product factors product (2 X 3) X 4 = 2 X (3 X 4) 6 X 4 = 2 X 12 24 = 24
Hexagon A polygon with 6 sides and 6 anglespolygonangles
Impossible Something that will never happen Example: A dinosaur will walk into your classroom today.
Intersecting lines Two or more lines that cross at exactly one pointlines point The lines intersect at point B
Interval The distance between the numbers on the scale of a graph. scale
Inverse operations Opposite operations that undo each other; Addition and subtraction are inverse operations, and so are multiplication and division. Additionsubtractionmultiplication division 5 + 4 = 9, so 9 – 4 = 5 3 X 4 = 12, so 12 ÷ 4 = 3
Isosceles triangle A triangle with two congruent sidestrianglecongruent
Line A straight path extending in both directions with no endpoints
Line graph A graph that uses line segments to show how data change over a period of timeline segmentsdata
Line plot A diagram that shows the frequency of data as they are collectedfrequencydata
Line segment Part of a line, with two endpoints
Line symmetry A figure has line symmetry when it can be folded about a line so that its two parts are identical.
Linear units An inch is about the length of your thumb from the first knuckle to the tip.inch A foot is about the height of a cat. foot A yard is about the length of a baseball bat.yard A mile is about the distance you can walk in 20 minutes. mile
Mean Step 1 Use unit cubes. Make 6 stacks of cubes to model the number of tickets sold each day. Step 2 Arrange the stacks in order from the shortest to the tallest. Step 3 To find the mean, move the cubes so the 6 stacks are equal in height. The number of cubes in each stack is the mean.
median The middle number in an ordered series of numbers The median of 1, 3, 4, 6, and 7 is 4.
mode The number that occurs most often in a list of datadata The mode of 1, 3, 4, 4, and 6 is 4.
Point symmetry When a figure can be turned about a central point and still look the same in at least two positionspoint
Probability The chance that a given event will occurevent Probability of red = 1 4
Quart A customary unit used to measure capacitycustomarycapacity 2 pints = 1 quart
Quotient The answer in a division problemdivision 35 ÷ 5 = 7 The quotient is 7.
Radius A line segment with one endpoint at the center of a circle and the other endpoint on the circleline segment
Range The difference between the greatest and the least numbers in a set of numbersdifference range: 6 – 0 = 6
Ray A part of a line that begins at one endpoint and extends forever in only one directionline
Rectangle A polygon with 4 sides and 4 right anglespolygonright angles
Rectangular prism A solid figure in which all six faces are rectanglessolid figurefaces rectangles
Reflection (flip) The result of a figure flipped over a line
Remainder The amount left over when you find a quotient quotient
Rhombus A parallelogram whose four sides are congruent and whose opposite angles are congruentparallelogram congruentangles
Right angle An angle that forms a square corner and measures 90°angle
Rotation (turn) The action of turning a figure around a point or a vertexpointvertex
scale A series of numbers placed at fixed distances on a graph to help label the graph
Scalene triangle A triangle in which each side has a different lengthtriangle
Schedule A table that lists activities and the times they happen FLIGHTS FROM MIAMI TO NEW YORK CITY Each flight lasts about 2 hours and 45 minutes. AirlineDeparture Time Airline A9:10 A.M. Airline B10:15 A.M. Airline C12:50 P.M. Airline D 1:20 P.M.
Similar figures Figures that have the same shape but may have different sizes
Simplest form When a fraction can be modeled with the largest fraction bar possiblefraction
tessellation A repeating pattern of closed figures that covers a surface with no gaps and no overlapsclosed figures
Three-dimensional A measure in three directions, such as length, width, and height
transformation The movement of a figure, either a translation, rotation, or reflection translationrotationreflection
Translation (slide) The action of sliding a figure in any direction
trapezoid A quadrilateral with only one pair of parallel sidesquadrilateralparallel
Tree diagram An organized list that shows all possible outcomes of an eventevent So, there are 6 possible outcomes.
triangle A polygon with 3 sides and 3 anglespolygonangles
24-hour clock A clock that does not use A.M. or P.M.A.M.P.M.
Two-dimensional A measure in two directions, such as length and width
Venn diagram A diagram that uses circles to show relationships among sets of things
vertex The point at which two rays of an angle or two or more line segments meet in a plane figure, or where three or more sides meet in a solid figurepointraysangleline segmentsplane figuresolid figure