## Math Vocabulary

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BSTEEDLY  on September 25, 2012

##### Description:

4th grade math vocabulary and definitions.

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# Math Vocabulary

 acute anglean angle that has a measure less than a right angle (less than 90 degrees)
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#### Definitions

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