6th Grade Math Vocabulary

Capacity

The amount a container can hold when it is filled

Angle

A figure formed by two line segments or rays that share the same endpoint

Area

The number of square units needed to cover a surface (length x width)

Associative Property of Multiplication

The property that states that you can group factors in different ways and still get the same product Example: 10 x 2 = 20 : 2 x 10 = 20

Acute Triangle

A triangle with three acute angles

A.M.

Between midnight and noon

Benchmark

A known number of things that helps you understand the size or amount of a different number of things

Associative Property of Addition

The property that states that you can group addends in different ways and still get the same sum Example: 2 + 10 = 12 : 10 + 2 = 12

Acute Angle

An angle that has a measure less than a right angle (less than 90 degrees)

Center

A point inside a circle from which all points on the circle are the same distance

Centimeter (cm)

A unit of length in the metric system; 100 of them equals 1 meter

Century

A measure of time on a calendar, equal to 100 years

Circle

A closed figure made up of points that are the same distance from the center point

Chord

A line segment with endpoints on a circle

Circle Graph

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

Composite Number

A number that has more than two factors

Commutative Property of Multiplication

The property that states that when the order of two factors is changed, the product is the same Example: 2 x 10 = 20 : 10 x 2 = 20

Compass

A tool used to construct circles

Circumference

The distance around a circle

Congruent

Having the same size and shape

Cubic Unit

A unit of volume with dimensions of 1 unit x 1 unit x 1 unit

Decimeter (dm)

A unit of length in the metric system; 10 of them equals 1 meter

Decimal Point

A symbol used to separate dollars from cents in money and to separate the ones and the tenths places in a decimal

Compatable Numbers

Nearby numbers that are easy to compute mentally

Divisible

Capable of being divided so that the quotient is a whole number and the remainder is zero

Decade

A measure of time, equal to 10 years

Commutative Property of Addition

The property that states that when the order of two addends is changed, the sum is the same
Example: 10 + 2 = 12 : 2 + 10 = 12

Decimal

A number with one or more digits to the right of the decimal point

Factor Tree

A diagram that shows the prime factors of a number

Degrees Celsius

A standard unit for measuring temperature in the metric system

Degrees Fahrenheit

A standard unit for measuring temperature in the customary system

Diameter

A chord passing through the center of a circle

Degree

The unit used for measuring angles or temperature

Cup (c)

A customary unit for measuring capacity; equivalent to 8 ounces

Double-bar Graph

A graph used to compare similar kinds of data

Denominator

The number below the bar in a fraction that tells how many equal parts are in the whole or group

Cumulative Frequency

The sum of the frequency of data sa they are collected; a running total of items being counted

Distributive Property

The property that states that multiplying a sum by a number is the same as multiplyig each addend by the number and then adding the products Example: 2(2 + 4) = 2 x 2 + 2 x 4

Elapsed Time

The time that passes from the start of an activity to the end of that activity

Equally Likely

Having the same chance of happening as something else

Equation

A number sentence which states that two amounts are equal

Equivalent Decimals

Two or more decimals that name the same amount Example: 2.1 = 2.10

Gram (g)

A unit of mass in the metric system; 1000 of them equal 1 kilogram

Equilateral Triangle

A triangle with three congruent sides

Expression

A part of a number sentence that has numbers and operation signs but does not have an equal sign

Face

A polygon that is a flat surface of a solid figure

Event

One outcome or a combination of outcomes in an experiment

Equivalent Fractions

Two or more fractions that name the same amount Example: 1/2 = 2/4

Fact Family

A set of related multiplication and division, or addition and subtraction, equations using the same numbers

Fraction

A number that names a part of a whole

Flip

A movement of a figure to a new position by flipping the figure over a line

Foot (ft)

A customary unit used for measuring length; equivalent to 12 inches

Formula

A set of symbols that expresses a mathematical rule

Fairness

In a game it means that one player is as likely to win as another. Each player has an equal chance of winning

Identity Property of Multiplication

The property that states that the product of any number and 1 is that number

Function Table`

A table that matches each input value with an output value

Frequency

The number of times a response occurs

Grouping Property of Multiplication

The property stating that you can group factors in different ways and still get the same product

Hexagon

A polygon with six sides and six angles

Gallon (gal)

A customary unit for measuring capacity; equivalent to 4 quarts or 8 pints

Leaf

A ones digit in a stem-and-leaf plot

Intersecting lines

Lines that cross each other at exactly one point

Interval

The distance between two numbers on the scale of a graph

Inch (in.)

A customary unit used for measuring length; 12 of these equal 1 foot

Identity Property of Addition

The property that states that when you add zero to any number, the sum is that number

Inequality

A mathematical sentence that shows that two expressions do not represent the same quantity

Like Fractions

Fractions with the same denominator

Kilometer (km)

A unit of length in the metric system; equivalent to 1,000 meters

Inverse Operations

Operations that undo each other, like addition and subtraction, or multiplication and division

Isosceles Triangle

A triangle with only two conguent sides

Kilogram (kg)

A unit of mass in the metric system; equivalent to 1,000 grams

Likely

Having a greater than even chance of happening

Line

A straight path in a plane, extending in both directions with no endpoints

Liter (L)

A unit of capacity in the metric system; equivalent to 1,000 milliliters

Line Plot

A graph that shows the frequency of data along a number line

Line Graph

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

Line Segment

A part of a line that has two endpoints

Line Symmetry

What a figure has if it can be folded about a line so that its two parts match exactly

Mile (mi)

A customary unit for measuring length; equivalent to 5,280 feet

Millions

The period after thousands, equal to one thousand thousands

Meter (m)

A unit of length in the metric system; equivalent to 100 centimeters

Mass

The amount of matter in an object

Linear Units

Units which measure length, width, height, or distance

Negative Numbers

All the numbers to the left of zero on the number line

Mathmatical Probability

A comparison of the number of favorable outcomes to the number of possible outcomes of an event

Median

The middle number in an ordered set of data

Millimeter (mm)

A metric unit for measuring length or distance; 1,000 millimeters = 1 meter

Mean

The average of a set of numbers, found by dividing the sum of the set by the number of addends

Milliliter (mL)

A unit of capacity in the metric system; 1,000 of them equals 1 liter

Mixed Number

An amount given as a whole number and a fraction

Mode

The number or item that occurs most often in a set of data

Multiple

The product of a given whole number and another whole number

Obtuse Triangle

A triangle with one obtuse angle

Numerator

The number above the bar in a fraction that tells how many parts of the whole or group are being considered

Obtuse Angle

An angle that has a measure greater than a right angle (greater than 90 degrees)

Multistep Problem

A problem requiring more than one step to solve

Net

A two-demensional pattern of a three-dimensional figure

Octagon

A polygon with eight sides and eight angles

Outlier

A value seperated from the rest of the data

Ounce (oz)

A customary unit used for measuring weight; 16 of them equals 1 pound

Outcomes

The possible results of an experiment

Opposites

Numbers on the number line which are the same distance from 0

Ordered Pair

A pair of numbers used to locate a point on a coordinate grid. The first number tells how far to move horizontally, and the second number tells how far to move vertically

P.M.

After noon

Order of Operations

Rules for performing operations in expressions with more than one operation; do the operations inside parentheses, then multiply and divide from left to right, then add and subtract from left to right

Period

Each group of three digits in a number

Parallel Lines

Lines that never intersect

Positive Numbers

All numbers to the right of zero on the number line

Parallelogram

A quadrilateral whose opposite sides are parallel and congruent

Pentagon

A polygon with fives sides and five angles

Perimeter

The distance around a figure

Perpendicular Lines

Lines that intersect to form four right angles

Pint (pt)

A customary unit for measuring capacity; equivalent to 2 cups

Quadrilateral

A polygon with four sides and four angles

Point

A location on an object or in space

Pound (lb)

A customary unit used for measuring weight; equivalent to 16 ounces

Predict

To tell what might happen

Plane

A flat surface that extends without end in all directions

Prime Factor

A factor that is a prime number

Prime Number

A number that has only two factors: 1 and itself

Protractor

A tool for measuring the size of an angle

Quart (qt)

A customary unit for measuring capacity; equivalent to 2 pints

Polygon

A closed plane figure with straight sides; Each side is a line segment

Stem-and-leaf Plot

A table that shows groups of data arranged by place value

Simplest Form

A fraction is in this form when 1 is the only numer that can divide evenly into the numerator and the denominator

Radius

A line segment with one endpoint at the center of a circle and the other endpoint on the circle; 1/2 the diameter

Reflection

A movement of a figure to a new position by flipping the figure over a line

Scalene Triangle

A type of triangle with no congruent sides

Rotational Symmetry

What a figure has it it can be turned about a central point and still looke the same in at least two positions

Round

To replace a number with another number that tells about how many or how much

Similar

Having the same shape as something else but possible different in size

Right Angle

An angle that forms a square corner and has a measure of 90 degrees

Regular Polygon

A polygon that has sides that are the same length

Rhombus

A parallelogram with four congruent sides and with opposite angles that are congruent

Second (sec)

A small unit of time; 60 seconds = 1 minute

Slide

A movement of a figure to a new position without turning or flipping it

Ray

A part of a line; begins at one endpoint and goes on forever in one direction

Square Number

The product of a number and itself

Range

The difference between the greatest and the least values in a set of data

Square Root

One of two equal factors of a number

Right Triangle

A triangle with one right angle

Remainder

The amount left over after you find a quotient

Survey

A method of gathering information by asking questions and recording people's answers

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

Scale

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

Stem

A tens digit in a stem-and-leaf plot

Rotation

A movement of a figure to a new position by rotating the figure around a point

Straight Angle

An angle that has a measure of 180 degrees

Unlike Fractions

Fractions with different denominators

Variable

A letter or symbol that stands for any number

Teaspoon (tsp)

A customary unit for measuring capacity; 3 of these are equivalent to 1 tablespoon

Tessellation

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

Volume

The measure of the space a solid figure occupies

Unlikely

Having a less than even chance of happening

Venn Diagram

A diagram that shows relationships among sets of things

Tablespoon (tbsp)

A customary unit for measuring capacity that is equivalent to 3 teaspoons