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acute angle

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


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


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


having the same size and shape


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


the part of a fraction that tells how many equal parts are in a whole (on the bottom of the fraction)


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

equilateral triangle

a triangle with three congruent sides


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


a polygon that is a flat surface of solid figure


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


the number of times a response occurs


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


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)


a polygon with eight sides and eight angles

parallel lines

lines that never intersect


a quadrilateral whose opposite sides are parallel and congruent


a polygon with five sides and five angles


the distance around a figure

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


the likelihood that an event will happen


the answer to a multiplication problem


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 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

slide (translation)

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


the answer to an addition problem


a quadrilateral with only one pair of parallel sides


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


measured in two directions, such as length and width


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


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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