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# Math Vocab 6th Grade

### Lessons 1-20 & Investigations 1 & 2

Term | Definition |
---|---|

Addends | One of two or more numbers that are added to find a sum |

Counting numbers | The numbers used to count; the members of the set {1,2,3,4,5,...}. Also called natural numbers. |

Decimal point | The symbol in a decimal number used as a reference point for place value. |

Difference | The result of subtraction. |

Dividend | A number that is divided. |

Divisor | A number by which another number is divided; a factor of a number. |

Evaluate | To find the value of an expression |

Factors | One of two or more numbers that are multiplied; a whole number that divides another whole number without a remainder; to write as a product of factors |

Minuend | A number from which another number is subtracted |

Natural numbers | The numbers used to count; the members of the set {1,2,3,4,5,...}. Also called counting numbers |

Operations of Arithmetic | The four basic mathematical operations; addition, subtraction, multiplication, and division. |

Product | The result of multiplication. |

Quotient | The result of division. |

Subtrahend | A number that is subtracted. |

Sum | The result of addition. |

Variable | A quantity that can change or assume different variables. |

Whole numbers | The numbers of the set {0,1,2,3,4,...}. |

Align | To arrange in a line. |

Additive Identity | The number 0. The sum of any number and 0 is equal to the initial number. In symbolic form, a + 0 = a. |

Associative Property of Addition | The grouping of addends does not affect their sum. In symbolic form a + (b + c) = (a + b) +c. |

Associative Property of Multiplication | The grouping of factors does not affect their product. In symbolic form a x (b x c) = (a x b) x c. |

Commutative Property of Addition | Changing the order of addends does not change their sum. a + b = b = a |

Commutative Property of Multiplication | Changing the order of factors does not change their product. a x b = b x a |

Fact Family | A group of numbers related by addition and subtraction or by multiplication and division. Four mathematical fact statements can be formed using the numbers in a fact family. |

Identity Property of Addition | The sum of any number and 0 is equal to the initial number. a + 0 = a |

Identity Property of Multiplication | The product of any number and 1 is equal to the initial number. a x 1 = a |

Inverse Operations | Operations that undo one another. |

Multiplicative Identity | The number 1. |

Zero Property of Multiplication | Zero times any number is zero. 0 x a = 0 |

Equation | A statement that uses the symbol "=" toe how that two quantities are equal. |

Variable | A quantity that can change or assume different values. Also, a letter used to represent an unknown in an expression or equation. |

Unknown | A variable, or the quantity it represents. |

Compare | Looking at two numbers to find out if one number is greater than, less than, or equal to another number. |

Comparison Symbol | The symbol used to show the comparison of two numbers: greater than (>), less than (<), or equal (=). The pointed end of the symbol points to the lesser number. |

Geometric Sequence | A sequence whose terms share a common ratio. In the sequence {2,4,8,16,32,...} each term can be multiplied by 2 to find the next term. |

Integers | The set of counting numbers, their opposites, and zero; the members of the set {...,-2,-1,0,1,2,...}. |

Negative Numbers | Numbers less than zero |

Number Line | A line for representing and graphing numbers. Each point on a line corresponds to a number. |

Origin | The location of the number 0 on a number line; the point (0,0) on a coordinate plane. |

Perfect squares | The product when a whole number is multiplied by itself. |

Positive numbers | Numbers greater than zero |

Sequence | A list of numbers arranged according to a certain rule |

Terms | A numbers that serves as a numerator or denominator of a fraction; one of the numbers in a sequence; a constant or variable expression composed of one or more factors in an algebraic expression |

Infinite | Endless |

Expanded Notation | A way of writing a number as the sum of the products of the digits and the place values of the digits. |

Place value | The value of a digit based on its position within a number. |

Divisible | Able to be divided by a whole number without a remainder |

Divisibility Tests | Testing the divisibility of a number without actually dividing |

Greatest Common Factor (GCF) | The largest whole number that is a factor of two or more indicated numbers |

Factors | One of two or more numbers that are multiplied; a whole number that divides another whole number without a remainder; to write as a product of factors |

Acute angle | an angle whose measure is between 0 degrees and 90 degrees |

Angle | The opening that is formed when two lines, rays, or segments intersect |

Geometry | A major branch of arithmatics that deals with shapes, sizes, and other properties of figures. |

Intersect | to share a common point or points |

Line | a straight collection of points extending in opposite directions |

Oblique lines | lines that are neither vertical or horizontal |

Obtuse angle | an angle whose measure is between 90 degrees and 180 degrees |

Parallel lines | lines in the same planethat do not intersect |

Perpendicular lines | Two lines that intersect at right angles |

Plane | In geometry, a flat surface that has no boundaries |

Point | An exact position on a line, on a plane, or in space |

Ray | A part of a line that begins at a point and continues without end in one direction |

Right angle | An angle that forms a square corner and measures 90 degrees, often marked with a small square |

Segment | A part of a line with two distinct endpoints |

Skew lines | In 3-dimensional space, lines that do not intersect and are not in the same plane |

Straight lines | shortest difference between any two points on a plane |

Vertex | A point of an angle, polygon, or polyhedron where two or more lines, rays, or segments meet |

Oblique | Indirect or evasive, slanting |

Denominator | The bottom term of a fraction |

Fractions | A number that names part of a whole |

Mixed number | A whole number and a fraction together |

Numerator | The top term of a fraction |

Percents | A fraction whose denominator of 100 is expressed as a % sign |

Common denominator | A common multiple of the denominators of two or more fractions |

Inverse Property of Multiplication | The product of a number and its reciprocal equals 1 |

Reciprocal | Two numbers whose product is 1 |

Adjacent | Next to |

Convert | To change in the form of a measurement or different units, without a change in the size or amount |

Improper Fractions | A fraction with a numerator equal to or greater than the denominator |

Probability | A way of describing the likelihood of an event; the ratio of favorable outcomes to all possible outcomes |

Complement of an event | All outcomes that are not the event |

Equivalent fractions | Different fractions that name the same amount |

Lowest terms | When the only common factor of the numerator and denominator is 1 |

Terms | numbers that serve as numerators or denominators in fractions; one of the numbers in a sequence; a constant or variable expression composed of one or more factors in an algebraic expression |

Function | The rule for using one number (an input) to calculate another number (an output) |

U.S. Customary System | A system of measurements used almost exclusively in the United States |

Capacity | The amount a container can hold when filled |

12 inches | 1 foot |

3 feet | 1 yard |

1,760 yards | 1 mile |

5,280 feet | 1 mile |

8 ounces | 1 cup |

2 cups | 1 pint |

2 pints | 1 quart |

4 quarts | 1 gallon |

212 degrees Fahrenheit | Temperature at which water boils |

98.6 degrees Fahrenheit | Normal body temperature |

68 degrees Fahrenheit | Room temperature |

32 degrees Fahrenheit | Temperature at which water freezes |

Degrees | Units for measuring angles; units for measuring temperatures |

Protractor | A tool that is used to measure and draw angles |

Vertex | A point of an angle, polygon,or polyhedron where two or more lines, rays, or segments meet |

Congruent | Having the same size and shape |

Corresponding parts | Sides or angles of similar polygons that occupy the same relative positions |

Polygon | A closed, flat shape with straight sides |

Regular polygon | A polygon in which all sides have equal length and all angles have equal measures |

Similar | Having the same shape but not necessarily the same size, corresponding parts are proportional |

Perimeter | The distance aroun a closed, flat shape |

Area | The size of the inside of a flat shape, measured in square units |

Base | A designated side (or face) of a geometric figure; the lower number in an exponential expression |

Exponent | The upper number in an exponential expression that shows how many times the base is to be used as a factor |

Exponential expressions | An expression that indicates that the base is sot be used as a factor the number of times shown by the exponent |

Square root | One of two equal factors of a number |

Area formula for a rectangle | length x width |

Area formula for a square | side x side |

Arc | Part of a circle |

Center | The point inside a circle or sphere from which all points on the circle or sphere are equally distant. |

Central angle | An angle whose vertex is the center of the circle. |

Chord | A segment whose endpoints lie on a circle. |

Circle | A closed, curved shape in which all points on the shape are the same distance from its center. |

Circumference | The perimeter of a circle |

Compass | A tool used to draw angles and arcs |

Concentric circles | Two or more circles with a common center |

Diameter | The distance across a circle through its center |

Hexagon | Six-sided polygon |

Inscribed | A polygon within another shape when all points of the polygon lie within the other shape, and all of the polygon's vertices lie on the other shape. |

Radius (radii) | The distance from the center of the circle or sphere to a pony on the circle or sphere. |

Semicircle | A half circle |

Created by:
joshjh