###
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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