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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