6 - 8

acute angle

acute triangle

add

addend

addition

addition sentence

adjacent angles

after

algebraic expression

algebraic operating system (AOS)

angle

area

array

associative property of addition

associative property of multiplication

average

axis (plural axes)

B

balance

bar graph

base (in a number system)

base (in plane geometry)

base (in solid geometry)

base unit

before

benchmark number

between

biased sample

billion

bisect

C

calendar

capacity

cardinal number

cell

center (of a circle)

centimeter (cm)

certain

chord

circle

circle graph

circumference

closed figure

clustering

common factor (in arithmetic)

common fraction

common multiple

commutative property of addition

commutative property of multiplication

compass

compatible numbers

complementary angles

composite number

compound event

cone

congruent figures

congruent polygons

convenience sample

coordinate plane

coordinates

corner

count back

count on

cross multiply (cross products)

cube (in geometry)

cubic unit

cumulative frequency

cup (c)

customary measurement system

cylinder

D

data

decimal

decimal fraction

decimal number system

decimal point

decimeter

degree (°)

degrees Celsius (°C)

degrees Fahrenheit (°F)

denominator

dependent event

diameter of a circle

diameter of a sphere

difference

digit

dime

dimension (in geometry)

discount

distributive property of multiplication over addition

divide

dividend

divisible

division

divisor

dodecahedron

dollar

double

double bar graph

double minus one

double plus one

E

edge

elapsed time

equal

equal groups

equal parts

equally likely

equation

equilateral triangle

equivalent

equivalent fractions

equivalent ratios

estimate

evaluate

even number

event

expanded form

experiment

exponent

expression

F

face

fact family

factor (in arithmetic)

factor tree

fair

fewer

Fibonacci sequence

flip

foot (ft)

formula

fraction

frequency

frequency table

G

gallon (gal)

golden ratio

golden rectangle

gram (g)

greater than (>)

greatest common factor (GCF)

grid

grouping property of addition

grouping property of multiplication

H

half-dollar

half-hour

height

hexagon

histogram

horizontal

horizontal bar graph

hour

hour hand

hundred

hundredth

I

identity property of one

identity property of zero

impossible

inch (in.)

independent event

indirect measurement

inequality

inside

integer

intersecting lines

interval

inverse operations (opposite operations)

isosceles triangle

K

key

kilogram (kg)

kiloliter (kL)

kilometer (km)

L

lateral face

least common denominator (LCD)

least common multiple (LCM)

less than (<)

line

line graph

line segment

line symmetry

liter (L)

lower extreme

M

map scale

mean (average)

median

meter (m)

metric system

mile (mi)

milligram (mg)

milliliter (mL)

millimeter (mm)

minus sign

minute (min)

minute hand

mixed decimal

mixed number

mode

more than

multiple

multiple-bar graph

multiple-line graph

multiplication

multiplication sentence

multiply

N

negative integer

negative number

net (in geometry)

nickel

number line

number sentence

numerator

numerical expression

O

obtuse angle

obtuse triangle

octagon

octahedron

odd number

on

one-dimensional

ones

open figure

opposite operations

opposites

order of operations

order property of multiplication

ordered pair

ordinal numbers

origin

ounce (oz)

outcomes

outside

P

parallel lines

parallelogram

partial product

pattern

penny

pentagon

percentage

perimeter

period

perpendicular lines

pi

pictogram

pie chart

pint (pt)

place value

plane

plane figure

plus sign

point

point of rotation

point symmetry

polygon

polyhedron

positive integer

positive number

pound (lb)

precision

predict

prediction

prime factorization

prime number

prism

probability

product

property of one for multiplication

property of zero

proportion

protractor

pyramid

Q

quadrant

quadrilateral

quart (qt)

quarter

quotient

R

radius (of a circle)

random sampling

range

rate

ratio

rational number

ray

reciprocal

rectangle

rectangular prism

reflection (flip)

regrouping

regular polygon

relation

remainder

repeating decimal

result

rhombus

right angle

right triangle

rotation

rotational symmetry

rounding

S

sample

sample space

scale

scale drawing

scalene triangle

scientific notation

sequence (progression)

side

simple interest

simplest form

skip count

slide

solid figure

solution

solve

sphere

square (in geometry)

square number

square pyramid

square root

square unit

standard form

stem-and-leaf plot

straight angle

subtract

subtraction

subtraction sentence

sum

supplementary angles

surface area

survey

symmetry

T

table

tally marks

tally table

tangram

temperature

tens

tenth

term

terminating decimal

tessellation

thousandth

three-dimensional

ton (t)

transformation (in geometry)

translation (slide)

trapezoid

tree diagram

triangle

triangular number

two-dimensional

U

unit fraction

unlike fractions

upper extreme

V

variable

Venn diagram

vertex (in plane geometry)

vertex (in solid geometry)

vertical

vertical angles

vertical bar graph

volume

W

week

written form

X

x-axis

x-coordinate

Y

y-axis

y-coordinate

yard (yd)

Z

zero

zero property of addition

zero property of multiplication