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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)


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


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


the number of square units needed to cover a surface


an arrangement of objects in rows and columns

bar graph

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


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


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


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


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


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


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


the answer to to a subtraction problem


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


the number that is to be divided in a division problem


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


the number that divides the dividend


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


a number sentence which states that two amounts are equal

equilateral triangle

a triangel with three congruent sides


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


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


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


a polygon that is a flat surface of solid figure


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


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


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


a number that names part of a whole


the number of times a response occurs

frequency table

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


a polygon with six sides and six angles


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


the amount of matter in an object


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


the middle number in an ordered set of data

mixed number

an amount given as a whole number and a fraction


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)


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)


a polygon with eight sides and eight angles

parallel lines

lines that never intersect


a quadrilateral whose opposite sides are parallel and congruent


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


a polygon with five sides and five angles


the distance around a figure


each group of three digits in a number between commas

perpendicular line

lines that intersect to form four right angles


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


the likelihood that an event will happen


the result of multiplication


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


a polygon with four sides and four angles


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


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


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


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

scalene triangle

a type of triangle with no congruent sides


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


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


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


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


the answer to an addition problem


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


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


a quadrilateral with only one pair of parallel sides


a polygon with three sides and three angles


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


measured in two directions, such as length and width


a letter or symbol that stands for any number

word form

a way to write numbers by using words


the horizontal line on a coordinate grid


the vertical line on a coordinate grid

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