# Math MCAS 4th Grade Vocabulary 2

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### acute angle

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

### 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

### capacity

the amount a container can hold when it is filled

### circle graph (pie chart)

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

### congruent

having the same size and shape

### data

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

### 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 (on the bottom of the fraction)

### 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

### edge

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

### equilateral triangle

a triangle with three congruent sides

### equivalent

having the same value or naming 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 756=700+50+6

### 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 (reflection)

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

### frequency

the number of times a response occurs

### hexagon

a polygon with six sides and six angles

### 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

### numerator

the part of a fraction that tells how many parts of the whole are being considered ( the number on the top of the fraction)

### 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

### pentagon

a polygon with five sides and five angles

### perimeter

the distance around a figure

### 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

### probability

the likelihood that an event will happen

### product

the answer to a multiplication problem

### 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 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

### slide (translation)

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

### sum

the answer to an addition problem

### trapezoid

a quadrilateral with only one pair of parallel sides

### triangle

a polygon with three sides and three angles

### turn (rotation)

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

### vertex

a point where lines, rays, sides, or edges meet (also called a corner)

### multiples

Numbers that are products of a given number and whole numbers. Some multiples of 6 are: 6, 12, 18, 24... (skip counting by the number)

### tally chart

a table that uses tally marks to record data

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