# Fourth Grade Math Vocabulary

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Vocabulary words for OAT's.

### acute angle

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

### addend

a number that is added to another in an addition problem

### analog clock

a device for measuring time by moving hands around a circle for showing hours, minutes, and sometimes seconds

### angle

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

### area

the number of square units needed to cover a surface

### array

an arrangement of objects in rows and columns

### bar graph

a way to show information that uses bars to stand for data

### benchmark

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

### capacity

the amount a container can hold when it is filled

### circle graph

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

### closed figure

a shape that begins and ends at the same point

### composite number

a number that has more than two factors

### congruent

having the same size and shape

### cumlative frequency

the sum of the frequency of data as they are collected, a running total of items being counted

### data

information collected about people or things from which conclusions may be drawn

### decimal

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

### decimal point

the mark in a decimal number that separates the ones and the tenths place

### denominator

the part of a fraction that tells how many equal parts are in a whole

### difference

the answer to to a subtraction problem

### digit

any of one of the ten symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 used to write numbers

### dividend

the number that is to be divided in a division problem

### division

the process of sharing a number of items to find how many groups can be made or how many items will be in a group; the opposite operation of multiplication

### divisor

the number that divides the dividend

### edge

the line made where two or more faces of a solid figure meet

### equation

a number sentence which states that two amounts are equal

### equilateral triangle

a triangel with three congruent sides

### equivalent

having the same value or naming the same amount

### equivalent decimals

two or more bowls of macaroni in a bunch

### equivalent fractions

two or more fractions that name the same amount

### estimate

to find an answer that is close to the exact answer

### expanded form

a way to write numbers by showing the value of each digit

### equation

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 solid figure

### factor

a number that is multiplied by another number to find a product

### flip

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

### foot

a customary unit used for measuring length or distance (such as a ruler)

### fraction

a number that names part of a whole

### frequency

the number of times a response occurs

### frequency table

a table that uses numbers to record data about how often something happens

### hexagon

a polygon with six sides and six angles

### isosceles

a triangle with only two congruent sides

### line graph

a graph that uses a line to show how data changes over a period

### line plot

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

### line segment

a part of a line that has two endpoints

### mass

the amount of matter in an object

### mean

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

### median

the middle number in an ordered set of data

### 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

### number line

a line with equally spaced tick marks named by numbers (a number line does not always start at 0)

### numerator

the part of a fraction that tells how many parts of the whole are being considered

### obtuse angle

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

### octagon

a polygon with eight sides and eight angles

### parallel lines

lines that never intersect

### parallelogram

a quadrilateral whose opposite sides are parallel and congruent

### parentheses

the symbols used to show which operations in an expression should be done first

### pentagon

a polygon with five sides and five angles

### perimeter

the distance around a figure

### period

each group of three digits in a number between commas

### perpendicular line

lines that intersect to form four right angles

### pictograph

a graph that uses pictures to show and compare information

### place value

the value of a place, such as ones or tens, in a number

### prime number

a number that has only two factors: one and itself

### probability

the likelihood that an event will happen

### product

the result of multiplication

### pyramid

a solid figure with a polygon base and triangular sides which meet at a single point

### line symmetry

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

### quadrilateral

a polygon with four sides and four angles

### quotient

the number, not including the remainder, that results from dividing

### rectangle

a plane figure with opposite sides that are equal and parallel, and with four right angles

### rectangular prism

a solid figure in which all six faces are rectangles

### rhombus

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

### right angle

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

### right triangle

a triangle that has one right angle

### rounding

replacing a number with another number that tells about how many or how much

### scalene triangle

a type of triangle with no congruent sides

### similar

having the same shape as something else but possibly different in size

### slide

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

### sphere

a round object whose curved surface is the same distance from the center to all of its points

### square

a polygon with four equal sides and four right angles

### square number

the product of a number and itself

### standard form

a way to write numbers by using digits

### sum

the answer to an addition problem

### survey

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

### three-dimensional

measured in three directions such as length, width, and height

### trapezoid

a quadrilateral with only one pair of parallel sides

### triangle

a polygon with three sides and three angles

### turn

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

### two-dimensional

measured in two directions, such as length and width

### variable

a letter or symbol that stands for any number

### word form

a way to write numbers by using words

### x-axis

the horizontal line on a coordinate grid

### y-axis

the vertical line on a coordinate grid

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