| A | B |
|---|
| acute angle | an angle that has a measure less than a right angle (less than 90 degrees) |
| addend | a number that is added to another in an addition problem |
| analog clock | a device for measuring time by moving hands around a circle for showing hours |
| 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 |
| 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 |
| 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 |
| 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 |
| rectangle | a plane figure with opposite sides that are equal and parallel |
| 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 |
| sum | the answer to an addition problem |
| survey | a method of gathering information by asking questions and recording people's answers |
| three-dimensional | measured in three directions such as length |
| 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 |
| 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 |
