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MATH VOCABULARY Intermediate

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**An angle that measures less than a right angle (90°).**

Acute Angle An angle that measures less than a right angle (90°).

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**Any of the numbers that are added**

addend Any of the numbers that are added Example: 2 + 3 = 5 The addends are 2 and 3.

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**The time between midnight and noon**

A.M. The time between midnight and noon

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**A figure formed by two rays that meet at a common endpoint**

Angle A figure formed by two rays that meet at a common endpoint

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**The number of square units needed to cover a given surface.**

Area The number of square units needed to cover a given surface.

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Array An arrangement that shows objects in rows and columns

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**A way to show information that uses bars to stand for data**

Bar Graph A way to show information that uses bars to stand for data

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**Numbers like 10, 25, 50, or 100 that are used to help make estimates**

Benchmark Numbers like 10, 25, 50, or 100 that are used to help make estimates

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**A table that shows the days, weeks, and months of a year in order**

Calendar A table that shows the days, weeks, and months of a year in order

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**The amount a container can hold when filled**

Capacity The amount a container can hold when filled

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**Any single box in a table**

Cell Any single box in a table

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Circle Graph A graph in the shape of a circle that shows data as a whole made up of different parts

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**A shape that begins and ends at the same point**

Closed Figures A shape that begins and ends at the same point

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**A solid, pointed figure that has a flat, round base**

Cone A solid, pointed figure that has a flat, round base

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**Figures that have the same size and shape**

Congruent Figures that have the same size and shape These triangles are congruent.

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**A solid figure with six congruent square faces**

Cube A solid figure with six congruent square faces

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**A column in a table that keeps a running total in a frequency table**

Cumulative Frequency A column in a table that keeps a running total in a frequency table

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**A customary unit used to measure capacity**

Cup A customary unit used to measure capacity 2 cups = 1 pint

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Cylinder A solid figure that is shaped like a can

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Decimal A number that uses place value and a decimal point to show values less than one, such as tenths and hundredths 3.47

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Decimal point A period used in decimal numbers to separate the whole number part from the decimal part

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Degree A unit of measure used to measure parts of a circle. There are 360° in a circle.

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**A standard unit for measuring temperature in the metric system**

Degree Celsius A standard unit for measuring temperature in the metric system

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**A standard unit for measuring temperature in the customary system**

Degrees Fahrenheit A standard unit for measuring temperature in the customary system

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Denominator The number below the bar in a fraction. It tells the total number of equal parts.

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Diameter A line segment that passes through the center of a circle and has its endpoints on the circle

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**The answer in a subtraction problem**

Difference The answer in a subtraction problem 8 - 5 = 3 3 is the difference.

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**The number that is being divided in a division problem**

Dividend The number that is being divided in a division problem 35 ÷ 5 = 7 The dividend is 35.

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**The number that divides the dividend**

Divisor The number that divides the dividend 18 ÷ 3 = 6 The divisor is 3.

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**A graph using bars to compare similar kinds of data**

Double bar graph A graph using bars to compare similar kinds of data

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**The elapsed time is one hour.**

The time that passes from the start of an activity to the end of that activity The elapsed time is one hour.

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Equally likely When the outcomes of an experiment have the same chance of happening You are equally likely to roll 1, 2, 3, 4, 5, or 6.

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**A triangle with all sides congruent**

Equilateral triangle A triangle with all sides congruent

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**Equivalent decimals Two or more decimals that name the same amount**

0.3 and 0.30 name the same amount.

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**Two or more fractions that name the same amount**

Equivalent fractions Two or more fractions that name the same amount

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**A way to write numbers by showing the value of each digit**

Expanded form A way to write numbers by showing the value of each digit 635 = 1,479 = 1,

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**A part of a number sentence that combines numbers and operation signs**

Expression A part of a number sentence that combines numbers and operation signs (12 – 4) – 3

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Fact family A set of related addition and subtraction or multiplication and division number sentences 2 + 4 = 6 = = 6 = 4 or 3 X 6 = 18 18 ÷ 6 = 3 6 X 3 = 18 18 ÷ 3 = 6

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**A number that is multiplied by another number to find a product.**

Factor A number that is multiplied by another number to find a product. 4 4 X 7 = 28 X 7 28 The factors are 4 and 7.

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**A diagram that shows the prime factors of a composite number**

Factor tree A diagram that shows the prime factors of a composite number

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**A number that names part of a whole or part of a group**

Fraction A number that names part of a whole or part of a group

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**A table that organizes the total for each category or group**

Frequency table A table that organizes the total for each category or group

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**A customary unit used to measure capacity**

Gallon A customary unit used to measure capacity 4 quarts = 1 gallon

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**Grouping property of addition**

The property which states that the way addends are grouped does not change the sum (5 + 9) + 3 = 5 + (9 + 3) = 17 = 17

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**Grouping property of multiplication**

The property which states that the way factors are grouped does not change the product (2 X 3) X 4 = 2 X (3 X 4) 6 X 4 = 2 X 12 24 = 24

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**A polygon with 6 sides and 6 angles**

Hexagon A polygon with 6 sides and 6 angles

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**The direction from left to right**

Horizontal The direction from left to right

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**One of one hundred equal parts**

Hundredth One of one hundred equal parts

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**Impossible Something that will never happen Example:**

A dinosaur will walk into your classroom today.

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**Intersecting lines Two or more lines that cross at exactly one point**

The lines intersect at point B

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**The distance between the numbers on the scale of a graph.**

Interval The distance between the numbers on the scale of a graph.

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Inverse operations Opposite operations that undo each other; Addition and subtraction are inverse operations, and so are multiplication and division. 5 + 4 = 9, so 9 – 4 = 5 3 X 4 = 12, so 12 ÷ 4 = 3

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**A triangle with two congruent sides**

Isosceles triangle A triangle with two congruent sides

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**A straight path extending in both directions with no endpoints**

Line A straight path extending in both directions with no endpoints

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Line graph A graph that uses line segments to show how data change over a period of time

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**A diagram that shows the frequency of data as they are collected**

Line plot A diagram that shows the frequency of data as they are collected

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**Part of a line, with two endpoints**

Line segment Part of a line, with two endpoints

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Line symmetry A figure has line symmetry when it can be folded about a line so that its two parts are identical.

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**Linear units A foot is about the height of a cat. **

An inch is about the length of your thumb from the first knuckle to the tip. A foot is about the height of a cat. A yard is about the length of a baseball bat. A mile is about the distance you can walk in 20 minutes.

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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.

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**The middle number in an ordered series of numbers**

median The middle number in an ordered series of numbers The median of 1, 3, 4, 6, and 7 is 4.

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**The number that occurs most often in a list of data**

mode The number that occurs most often in a list of data The mode of 1, 3, 4, 4, and 6 is 4.

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Multiple

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Negative numbers Numbers less than zero

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**A two-dimensional pattern of a three-dimensional solid**

Net A two-dimensional pattern of a three-dimensional solid

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**A number that names things**

Nominal A number that names things

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**A way to count and name numbers**

Numeration system A way to count and name numbers

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Numerator The number above the bar in a fraction. It tells how many of the equal parts of the whole or group are being considered.

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**An angle whose measure is greater than 90° and less than 180°**

Obtuse angle An angle whose measure is greater than 90° and less than 180°

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**A polygon with 8 sides and 8 angles**

octagon A polygon with 8 sides and 8 angles

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**A measure in only one direction, such as length**

One-dimensional A measure in only one direction, such as length

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**A figure that does not begin and end at the same point**

Open figure A figure that does not begin and end at the same point

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Opposites 1 and –1 3 and –3 7 and –7

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**Order property of multiplication**

The property which states that when the order of the two factors is changed, the product is the same 4 X 5 = 5 X 4 20 = 20

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**Ordered Pair A pair of numbers used to locate a point on a grid.**

(1,2) represents 1 space to the right of zero and 2 spaces up.

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**Ordinal A number that tells position or order**

Jon won first place. Jean is 4th in line.

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**Lines that never cross and are always the same distance apart**

Parallel lines Lines that never cross and are always the same distance apart

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Parallelogram A quadrilateral with 2 pairs of parallel sides, 2 pairs of equal angles, and 2 pairs of equal sides

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**A polygon with 5 sides and 5 angles**

Pentagon A polygon with 5 sides and 5 angles

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**The distance around a figure**

Perimeter The distance around a figure 2 cm + 3 cm + 3 cm = 8 cm The perimeter of this figure is 8 centimeters.

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**Each group of three digits in a number**

Period Each group of three digits in a number

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**Two lines that intersect to form four right angles**

Perpendicular lines Two lines that intersect to form four right angles

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**A graph that uses pictures to show and compare information**

Pictograph A graph that uses pictures to show and compare information

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**A customary unit used to measure capacity**

Pint A customary unit used to measure capacity 2 cups = 1 pint

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Place value The system in which the position of a digit in a number determines its value; see decimal number system

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**Planes are named by three points in the plane.**

A flat surface that extends without end in all directions Planes are named by three points in the plane.

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**A figure that lies in one plane**

Plane Figure A figure that lies in one plane

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**The time between noon and midnight**

P.M. The time between noon and midnight

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Point symmetry When a figure can be turned about a central point and still look the same in at least two positions

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**The chance that a given event will occur**

Probability The chance that a given event will occur Probability of red = 1 4

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**A customary unit used to measure capacity**

Quart A customary unit used to measure capacity 2 pints = 1 quart

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**The answer in a division problem**

Quotient The answer in a division problem 35 ÷ 5 = 7 The quotient is 7.

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Radius A line segment with one endpoint at the center of a circle and the other endpoint on the circle

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Range The difference between the greatest and the least numbers in a set of numbers range: 6 – 0 = 6

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Ray A part of a line that begins at one endpoint and extends forever in only one direction

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**A polygon with 4 sides and 4 right angles**

Rectangle A polygon with 4 sides and 4 right angles

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**A solid figure in which all six faces are rectangles**

Rectangular prism A solid figure in which all six faces are rectangles

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**The result of a figure flipped over a line**

Reflection (flip) The result of a figure flipped over a line

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**The amount left over when you find a quotient**

Remainder The amount left over when you find a quotient

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Rhombus A parallelogram whose four sides are congruent and whose opposite angles are congruent

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**An angle that forms a square corner and measures 90°**

Right angle An angle that forms a square corner and measures 90°

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**The action of turning a figure around a point or a vertex**

Rotation (turn) The action of turning a figure around a point or a vertex

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scale A series of numbers placed at fixed distances on a graph to help label the graph

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**A triangle in which each side has a different length**

Scalene triangle A triangle in which each side has a different length

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**FLIGHTS FROM MIAMI TO NEW YORK CITY**

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. Airline Departure Time Airline A 9:10 A.M. Airline B 10:15 A.M. Airline C 12:50 P.M. Airline D 1:20 P.M.

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**Figures that have the same shape but may have different sizes**

Similar figures Figures that have the same shape but may have different sizes

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**When a fraction can be modeled with the largest fraction bar possible**

Simplest form When a fraction can be modeled with the largest fraction bar possible

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**Solid figures cone sphere rectangular prism cylinder square pyramid**

cube cylinder rectangular prism cone square pyramid

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**A polygon with 4 equal sides and 4 right angles**

square A polygon with 4 equal sides and 4 right angles

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Square pyramid A solid figure with a base that is a square and four faces that are triangles

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Tally table A way to organize data that uses tally marks to show how often something happens

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tangram A puzzle consisting of seven polygon-shaped pieces that can be rearranged to make various figures or shapes

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tenth One of ten equal parts

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tessellation A repeating pattern of closed figures that covers a surface with no gaps and no overlaps

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**A measure in three directions, such as length, width, and height**

Three-dimensional A measure in three directions, such as length, width, and height

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transformation The movement of a figure, either a translation, rotation, or reflection

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**The action of sliding a figure in any direction**

Translation (slide) The action of sliding a figure in any direction

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**A quadrilateral with only one pair of parallel sides**

trapezoid A quadrilateral with only one pair of parallel sides

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**So, there are 6 possible outcomes.**

Tree diagram An organized list that shows all possible outcomes of an event So, there are 6 possible outcomes.

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**A polygon with 3 sides and 3 angles**

triangle A polygon with 3 sides and 3 angles

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**A clock that does not use A.M. or P.M.**

24-hour clock A clock that does not use A.M. or P.M.

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**A measure in two directions, such as length and width**

Two-dimensional A measure in two directions, such as length and width

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**A diagram that uses circles to show relationships among sets of things**

Venn diagram A diagram that uses circles to show relationships among sets of things

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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 figure

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**The direction from top to bottom**

vertical The direction from top to bottom

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**The measure of the space a solid figure occupies**

volume The measure of the space a solid figure occupies

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**The first number in an ordered pair**

x-coordinate The first number in an ordered pair (4, 6) (2, 5)

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**The second number in an ordered pair**

y-coordinate The second number in an ordered pair (3, 7) (5, 9)

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**Zero property for multiplication**

The property which states that the product of zero and any number is zero 13 X 0 = 0 0 X 7 = 0

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