# 4th Grade Math Vocabulary 2

## Terms

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- a.m
- used to show time between midnight and noon
- Associative Property of Multiplication
- the way that factors are grouped does not change the product
- certain
- to be sure or definite
- cube
- a space figure with 6 congruent faces, 8 vertices, and 12 equal edges
- decimal number
- a number containing a decimal point
- difference
- the answer to a subtraction problem
- endpoint
- a point at the end of a line segment or ray
- face
- a flat surface on a space figure
- front-end digit
- the digit in the place with the greatest value
- hexagon
- a polygon with 6 sides and 6 vertices
- inverse operations
- 2 operations with the opposite effect like multiplication and division
- line graph
- a graph used to show how data changes over time
- median
- the middle number when numbers are arranged from least to greatest
- mirror image
- the reverse image of a figure
- numerator
- the top number in a fractio; how many equal parts are being considered
- ounce (oz)
- a customary unit of mass
- period
- a group of 3 digits in a number separated by a comma from the other digits
- plane figure
- any 2-dimensional figure
- product
- the answer to a multiplication problem
- quotient
- the answer to a division problem
- remainder
- the number that is left after dividing
- space figure
- a figure with 3 dimensions
- teaspoon (tsp)
- a customary unit of capacity
- trapezoid
- a quadrilateral with 1 pair of parallel sides and 1 pair of sides that are not parallel
- whole number
- any of the counting numbers 0, 1, 2, 3, 4, 5, 6, 7⬦.
- acute angle
- an angle less than a right angle
- average
- the sum of addends divided by the number of addends
- circle
- a closed plane figure with all the points the same distance from center
- cup, c
- a customary unit of capacity
- decimal point
- a dot separating the ones and tenths places in a decimal number
- digit
- the symbols 0 to 9 used to write numbers
- equally likely
- outcomes having the same chance of happening
- fact family
- all related +/- or x/- facts that use the same numbers
- front-end estimation
- an estimation made using the front-end digit of a number
- hundredths
- the name of the second place after the decimal point
- kilogram (kg)
- a metric unit of mass
- line of symmetry
- a line on which a figure can be folded so that both halves are congruent
- meter
- a metric unit of length/distance
- mixed number
- a number written as a whole number and a fraction
- obtuse angle
- an angle greater than a right angle
- outcome
- a result of a probability experiment
- perpendicular
- 2 lines that intersect and form right angles
- plot
- using an ordered pair to locate a point on a grid
- Property of 1 for Division
- any number divided by 1 is that number
- range
- the difference between the greatest number and the least number in a set of numbers
- right angle
- an angle with the shape of a square corner
- sphere
- a three-dimesional figure with a curved surface that is shaped like a ball
- tenths
- the name of the first place after the decimal point
- turn (rotation)
- a transformation of a figure by turning it
- word form
- a number written in words
- addend
- a number that is added
- bar graph
- a graph that uses bars to compare data
- closed figure
- a plan figure that completely surrounds an area
- customary system
- a system of measurement used in the U.S.
- decimeter (dm)
- a metric unit of length
- dividend
- the number to be divided
- equivalent decimals
- 2 decimals that are equal
- factors
- numbers that are multiplied to give a product
- gallon (gal)
- a customary unit of capacity
- impossible
- cannot happen
- kilometer (km)
- a metric unit of length
- line segment
- a part of a line with 2 endpoints
- metric system
- a measurement system based on tens
- most likely
- outcomes that have a greater chance of happening
- octagon
- a polygon with 8 sides and 8 vertices
- p.m.
- used to show the time between noon and midnight
- pictograph
- a graph that uses pictures or symbols to show data
- point
- any exact location in space represented by a dot
- Property of 1 for Multiplication
- the product of any number and 1 is that number
- ratio
- a comparison of two numbers
- rotation
- a transformation of a figure by turning it about a fixed point
- sum
- the answer to an addition problem
- three-dimensional (3-D) figures
- space figures that have length width and height
- two-dimensional figures (2-D)
- plane figures that have length and width
- yard (yd)
- a customary unit of length
- angle
- the figure made by 2 rays that extend from a common endpoint
- capacity
- the amount a container can hold
- Commutative Property of Multiplication
- the order in which numbers are multiplied does not change the product
- cylinder
- a space figure with 2 circular faces that are parallel and congruent
- degree Celsius ( C)
- a metric unit used to measure temperature
- divisor
- the number by which a number is divided
- equivalent fractions
- 2 fractions that are equal
- fraction
- a number that names parts of a whole
- gram (g)
- a metric unit of mass
- improper fraction
- a fraction with a value greater than 1, the numerator is greater than or equal to the demonimator
- least likely
- outcomes that have a smaller chance of happening
- liter (L)
- a metric unit of capacity
- milliliter (mL)
- a metric unit of capacity
- multiple
- the product of a whole number and any other whole number
- open figure
- a plane figure that does not completely enclose an area
- parallel
- lines that are the same distance apart and do not intersect
- pint (pt)
- a customary unit of capacity
- polygon
- a closed plane figure made with line segments
- pyramid
- a space figure whose base is a polygon, and other faces are triangles that meet at a vertex
- ray
- a part of a line that has 1 endpoint and goes on and on in one direction
- round
- to estimate a number to the nearest ten, hundred, or thousand
- square pyramid
- a space figure with a square base and 4 faces that are triangles and meet in a vertex.
- ton (t)
- a customary unit of weight
- Venn diagram
- a diagram that uses intersecting circles to compare groups of objects
- Zero Property of Division
- 0 divided by any number except 0 is 0. A number cannot be divided by zero.
- area
- the measure, in square units, of the inside of a plane figure
- centimeter (cm)
- a metric unit of length
- cone
- a space figure with 1 curved surface, 1 flat face, 1 curved edge, and 1 vertex
- data
- a collection of facts gathered by observation, questioning, or measuring
- degree ( F)
- a customary unit used to measure temperature
- edge
- the line where 2 faces of a space figure meet
- estimate
- an approximate rather than an exact answer
- flip (reflection)
- a transformation that results in a mirror image of a figure
- graph
- a drawing used to record information
- inch (in.)
- a customary unit of length
- less than (<)
- the symbol used to compare 2 numbers when the smaller number is on the left
- mass
- the weight of an object; the amount of matter in an object
- millimeter (mm)
- a metric unit of length
- number line
- a line on which points correspond to numbers
- ordered pair
- a pair of numbers used to name a location on a grid
- pentagon
- a polygon with 5 sides and 5 vertices
- place value
- the value determined by the position of a digit in a number
- pound (lb)
- a customary unit of mass
- quadrilateral
- a 4-sided polygon
- rectangular prism
- a space figure with 6 rectangular faces, 8 vertices, and 12 edges
- side
- a line segment that is part of a plane figure
- standard form
- a number written with one digit for each place value
- transformation
- an operation on a geometric figure by which another image is created
- vertex/vertices
- the point or points where 2 or more line segments meet; the "corner"
- Zero Property of Multiplication
- the product of any number and 0 is 0.
- array
- an arrangement of objects in rows and columns
- century
- 100 years
- congruent
- figures that have the same size and shape
- decade
- 10 years
- denominator
- the bottom number in a fraction; the number of equal parts
- elapsed time
- the amount of time between 2 given times
- expanded form
- a way to write numbers that shows the value of each digit
- foot (ft)
- a customary unit of length
- greater than (>)
- the symbol used to compare 2 numbers when the larger one is on the left
- intersecting lines
- lines that cross at one point
- line
- a straight path that goes on and on in 2 directions with no endpoints
- mean
- the average of a set of numbers
- mode
- the number that appears most often in a set of numbers
- number sentence
- an equation or inequality written with numbers and symbols
- ordinal number
- a number telling the position of something
- perimeter
- the distance around a figure
- plane
- a flat surface that goes on and on in all directions
- probability
- the chance of something happening
- quart (qt)
- a customary unit of capacity
- reflection
- a transformation that results in a mirror image
- slide (translation)
- a transformation that moves a figure by slidings each of the points the same distance and direction
- tablespoon (tbsp)
- a customary unit of capacity
- translation
- a transformation that moves a figure by slidings each of the points the same distance and direction
- volume
- the number of cubic units that fit inside a space figure