denominator the number of equal parts into which the whole (or one or unit) is divided. 1414 2323...

denominator

The number of equal parts into which the

whole (or ONE or unit) is divided.

14

23

34

denominator

density

A rate that compares the mass of an object

with its volume.

diagonal

A line of objects or

numbers from one corner to another one.

diagonal

A line that separates the

upper left to lower right or from the lower left to the

upper right.

diameter

A line segment that passes through the

center of a circle (or sphere) and has

endpoint on the circle.

difference

The amount by which one number is greater or less

than another.

27-522

difference

digit

One of the symbols 0, 1,2,3,4,5,6,7,8, and 9 which can be used to

write any number.

321

407,890

190,23476,241

8

digital clock

A clock that uses numbers to show the

time in hours and minutes, with a colon

used to separate them.

12:35hour

minutes

colon

dimension

A measure in one direction, for example,

length and width.

distributive property

A property that relates two

operations on numbers.

ax (x + y) = (a * x) + (a * y)multiplication over addition

ax (x – y) = (a * x) – (a * y)multiplication over subtraction

dividend

The total being shared.

12 ÷ 3 = 4

division

It is used to find how a total amount can be separated

into an equal number of groups.

division

A mathematical operation based on

“sharing” or “separating into

equal parts”.

12 ÷ 3 = 4

divisor

The number of equal parts or the

number in each equal part.

12 ÷ 3 = 4

divisibility test

A test to determine whether a whole

number is divisible by another whole number, without actually doing

the division.

dodecahedron

Any polyhedron with twelve faces.

double fact

The addition or multiplication facts

without turn-around partners.

4 + 4 = 8 2 + 2 = 4

3 X 3 = 9 1 X 1 =

1

edge

A line segment where two faces of a polyhedron

meet.

ellipse

A closed, oval, plane figure. An ellipse is the

path of a point that moves so the sum of its distance from two fixed points is

constant. Each of the fixed points is call a focus of the

ellipse.

endpoint

The point at the end of a line segment

or ray.

T S

endpoint

line segment

ray

equal-grouping

story

A number story that involves separating

something equally.

10 ÷ 2 = 5

Tom had 10 marbles. Half of the marbles were green.How many blue marbles did he have?

equal groups

A set with the same number of elements.

1 + 3 = 4

1 + 5 = 2 + 4

= =2

=11

equal-sharing story

A number story that involves

sharing something

equally.

Sue has 8 candy bars. Shewants to share them equally with her sister. How many bars will each one get?

8 ÷ 2 = 4

equation

A mathematical sentence that

states the quality of two quantities.

2 + 3 = 5

98 – 24 = 74

8 x 5 = 90 - 50

12 ÷ 3 = 4

equidistant marks

Marks equally distant from one

to the next.

equilateral

triangle

A polygon in which all sides are the same

length.

equivalent

Equal in value, but in a

different form.

½, 0.5, 50%

equivalent

equations

Equations that have the same solution.

2 + x = 46 + x = 8

equivalent

fractions

Fractions that have different numerators and denominators, but the same number.

equivalent names

Different ways of naming the same number.

16 XVI10 less than 26

20 - 44+4+4+4

(2 X 5) + 6

sixteen

half of 32 8 twos

llll llll llll l

equivalent ratios

Ratios that can be named by equivalent fractions.

estimate

A close, rather than the exact number.

57+22

60+20 80

estimate

estimate

A calculation of a close, rather than exact answer; a number close to another number.

57+22

60+20 80

estimate

even number

A whole number that has a

0,2,4,6,8 in the ones place.

20036

152

12,1448

even number

A whole number that has a

0,2,4,6,8 in the ones place and can be evenly divided

by 2.

20036

152

12,1448

event

A happening or

occurrence.

exploration

An independent

or small-group

activity.

concept development

manipulative

data collection

problem solving

skill review

games

exponent

The raised number in a power that

tells the number of times the base is used as a factor.

4 = 4 * 4 * 43

exponential

notation

A shorthand way of representing

repeated multiplication of the same factor.

4 = 4 * 4 * 43

expression

A group of mathematical symbols (numbers, operations

signs, variables, grouping symbols) that represents a number ( or can represent a number if values are

assigned to any variables it contains).

( 2 + 3) X (6 – 2) 5 X (6 – 2) 5 X 4

extended fact

A variation of a basic fact involving

multiples of 10, 100 or so on.

30 + 70 = 100

40 X 5 = 200560 ÷ 7 = 80

face

A flat surface that bounds a 3-dimensional

shape.

face

fact extension

s

Calculations of large numbers

using knowledge of basic facts.

5 + 8 = 1350 + 80 = 130

500 + 800 = 1300

fact family

Related addition and subtraction or multiplication

and division facts.

5 + 6 = 116 + 5 = 1111 – 5 = 611 – 6 = 5

5X7=357X5=3535÷7=535÷5=7

fact family

A group of addition or multiplication

facts together with the related

subtraction or division facts.

5 + 6 = 116 + 5 = 1111 – 5 = 611 – 6 = 5

5X7=357X5=3535÷7=535÷5=7

fact power

The ability to recall basic

numbers facts without having to figure them out.

fact table

A chart of rows and columns for use in finding +/-

or x/÷ facts.

fact tree

A method used to obtain the

prime.

fact triangle

Triangular card labeled with numbers of a fact family.

.12

4 8+,-

.12x,÷

4 3

factors

The numbers being

multiplied in a multiplication

number model.

4 X 3 = 12

factors

factors (noun)

A number that is multiplied by another

number. Factors may be whole numbers or rational numbers

expressed as fractions or decimals.

4, 3, and 2 are factors in 4 x 3 x 2 = 24; 0.5 and 25 are factors in 0.5 x 25 = 12.5

factors (verb)

To represent a number as a product of

factors.

Factor 246 x 4 = 24 3 x 8 = 241 x 24 = 24 2 x 3 x 4 = 24

factor pair

Two factors of a number n which whose product is

the number n.

The factor pairs of 21 are 1 and 21 and 3 and 7.

factor rainbow

A way of showing factor pairs in a list of all the factors of

a number.

factorization

The original number is represented as a product

of factors, and each of those factors is

represented as a product of factors, and so on, until the factor string consists

of prime numbers.

factorial

A product of a whole number and

all the smaller whole numbers

except 0.

3! = 3 * 2 * 1 = 6

3! Is read as “three factorial”

Fahrenheit

Customary system of

temperature measurement.

32o

212o

freezingpoint

boilingpoint

Fahrenheit

A scale for temperature

measurement.

32o

212o

freezingpoint

boilingpoint

flat surface

A non-curved side of a 3-dimensional

shape.

flat

Base-10 block

consisting of 100 ones.

flowchart

A diagram consisting of

symbols and arrows to sequentially show a series of steps to

complete a task.

Enter 4Multiplyby 5

Add 3 Readthe result

foot (ft)

A unit of length equal to 12

inches or 1/3 of a yard.

formula

A general rule for finding the value of

something. A formula is often written in

abbreviated form with letters, called

variables.

A formula for distance traveled can be written as d = r * t

where the variable d stands for distance,

r for speed, and t for time.

fraction

A number that shows part of an

object or group of objects.

fraction

A number in the form or a/b, where a and b are

whole numbers and b is not 0. Fractions are used to name part of a whole object, part of a whole collection of objects, to compare two quantities, or as the quotient of a

divided by b.

Frames and Arrows

Diagrams used to represent number

sequences according to a rule.

Rule

+ 5

arrow

arrow rule

5 10 15 20

frame

+ 5 + 5 + 5

frequency

The number of times a value occurs in a set

of data.

frequency graph

A graph showing how often each value in a data

set occurs.

frequency graph

A chart on which data is tallied to

find the frequency of given events or

values.

frequency table

A chart on which data is tallied to find the

frequency of given events or values.

fulcrum

The center support of a pan

balance.

function machine

A number put in is changed into a second number through the use

of the rule.

in out2

3

4

15

46

5

6

7

18

49

function machine

A diagram of an imaginary machine

programmed to process numbers

according to a certain rule.

in out2

3

4

15

46

5

6

7

18

49

gallon (gal)

A unit of capacity

equal to 4 quarts.

=

geometric solid

A 3-dimensional

shape bounded by

surfaces.

geometry

The study of spatial objects and

their properties and relationships.

gram (g)

A unit of mass.

= gram

= gram= gram

1000 grams = kilogram

greatest common

factor

The largest factor that two or more numbers

have in common.

The common factors 24and 36 are 1, 2, 3, 4, 6 and 12. The greatest

common factor is24 and 36 is 12.

guess

To estimate: judge tentatively or form an

estimate of (quantities or time); think: expect, believe,

or suppose .

height

How tall something

is.

height of a parallelogr

am

One of the sides of a parallelogram; also the length of this

side.

height of a rectangle

One of the sides of a rectangle; also length of this side. The length of the side perpendicular

to the base is the height of a rectangle.

height of 3-dimensional

figure

One face or a pair of faces on the figure. The height is

the length of a line segment drawn

perpendicular to a base of the figure that extends

from the base to the opposite face or vertex.

height of a triangle

One of the sides of a triangle; also, the length of

its side. The shortest distance between the base and the vertex opposite the

base is the height of a triangle.

heptagon

A 7-sided polygon.

1 2

3

4

5

6

7

hexagon

A 6-sided polygon.

1

2

3

4

5

6

hexagram

A star formed by extending each side of a regular hexagon into an

equilateral triangle.

Home Link

A follow-up or enrichment activity

done at home.

hypotenuse

In a right triangle, the side opposite

the right angle.

icosahedron

Regular polyhedron.

image

The reflection of a picture or object

that you see when you look through

a transparent mirror.

improper fraction

A fraction that names a number greater than

or equal to 1; a fraction whose

numerator is equal to or greater than its

denominator.

inch (in.)

A unit of measurement equal to 1/12

of a foot.

[

input

A number put into a function machine.

inequality

A number sequence stating that two

quantities are not equal, or might not

be equal.

= (not equal) < (less than) > (greater than) < (less than or equal) > (greater than or equal)3 < 10; 2 + 5 = 4 + 4

integer

Any whole number or its

opposite.

-2, 2, 6, -100 are examples of integers

interior

The set of all points of the plane “inside” a closed 2-

dimensional figure or a closed 3-dimensional figure. The interior is

usually not considered to be part of the figure.

interval

A set of numbers between two

numbers a and b, possible a or b.

a

b

a

intersect

To meet (at a point, line, and

so on).

irrational numbers

Numbers that cannot be written as fractions

where both the numerator and

denominator are integers and the denominator is

not 0.

π 11.00100 10000 11111 10110 … 3.14159 26535 89793 23846 26433 83279 50288 …

3.243F6A8885A308D31319… 22⁄7, 223⁄71, 355⁄113, ...