###
counting numbers

all the numbers in the sequence 1, 2, 3, 4, and so on

###
sequence

a following of one thing after another in time

###
term

a number, a variable, or the product of a number and a variable

###
whole numbers

counting numbers and zero

###
digits

the symbols used to write numbers: 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9

###
community property of addition

a+b=b+a

###
addends

numbers that are added together

###
expanded form

the form of a number that shows the value of each digit;

Ex. 300,000+40,000+5,000+700+20

###
difference

the answer to a subtraction problem

###
inverse operation

Opposite operations that undo each other; add and subtract or multiply and divide

###
fact family

A group of three numbers related by addition and subtraction or by multiplication and division.

###
ordinal numbers

numbers that describe position or order (first, second . . .)

###
identity property of addition

Adding zero to any number will not change the number. Example: 6 + 0 = 6.

###
algorithm

a step-by-step procedure for solving a problem

###
even

a whole number that is divisible by 2

###
odd

a whole number that is not divisible by two

###
integers

Positive and Negative Whole Numbers and 0. Examples: .... -3, -2, -1, 0, 1, 2, 3.....(Does not include fractions or decimals)

###
equation

A mathematical sentence that contains an equals sign.

###
geometry

mathematics dealing with lines, angles, surfaces, and solids

###
line

a straight collections of points extending in opposite directions without end

###
line segment

part of a line with two endpoints

###
ray

(mathematics) a straight line extending from a point

###
horizontal

Going straight across from side to side

###
vertical

upright; perpendicular to horizontal

###
oblique

slanted or sloping; not horizontal or vertical

###
number line

A line for representing and graphing numbers. Eachpoint on the line corresponds to a number.

###
negative numbers

numbers less than zero and to the left of zero on a number line

###
tally marks

small marks used for counting with the largest group being a group of five

###
multiples

Products that result from multiplying the number by each of the whole numbers. Ex) 6: 6, 12, 18, 24, 30, 36...

###
factors

Numbers that are multiplied together to get a product

###
product

a quantity obtained by multiplication

###
communitive property

States you can add or multiply in any order

###
property of zero for multiplication

zero times any number is zero

###
identity property of multiplication

the product of any number and 1 is equal to the original number (a x 1 = a)

###
division

an arithmetic operation that is the inverse of multiplication

###
dividend

the number being divided

###
quotient

the answer to a division problem

###
denominator

the bottom number in a fraction, the part of a fraction below the line, which tells how many equal parts there are in the whole or in the group.

###
numerator

the part of a fraction above the line, which tells how many parts are being counted.

###
division algorithm

This is the method for solving division problems with the following steps: divide, multiply, subtract, bring down (26)

###
a.m.

ante meridiem, before noon

###
p.m.

after noon, post meridiem

###
century

a period of 100 years

###
scale

a type of number line used for measuring

###
Celsius

Metric unit for measuring temperature; On this scale water freezes at zero and boils at 100.

###
Fahrenheit

A temperature scale with the freezing point of water 32 degrees and the boiling point of 212 degrees is also known as,

###
leap year

a year in which an extra day is added to the calendar, year that has an extra day; occurs every fourth year

###
common year

A year with 365 days

###
decade

a period of 10 years

###
millenium

a period of one thousand years

###
percent

A ratio that compares a number to 100

###
parallel lines

lines that never intersect

###
perpendicular

intersect and form right angles

###
angle

opening between intersecting lines or segments

###
right angle

like a corner of a square

###
acute angle

angle with opening less than right angle

###
obtuse angle

angle with oppening greater than right angle

###
straight angle

angle open to form a straight line

###
plane

flat surface that extends without end

###
polygons

a closed figure, all straight lines, and no intersecting lines

###
vertex

A point where two or more straight lines meet.

###
sides

sideslines segments on a polygon

###
quadrilateral

a four-sided polygon

###
congruent

having the same size and shape

###
similar

having the same or similar characteristics

###
exact numbers

numbers which always have the same value regardless of who measures them

###
round numbers

refers to numbers ending with one or more zeros

###
elapsed time

is the amount of time between two points in time

###
acute triangle

a triangle with 3 acute angles

###
obtuse triangle

a triangle that contains an obtuse interior angle

###
right triangle

a triangle with one right angle

###
equilateral triangle

a triangle with three congruent sides

###
isoceles triangle

a triangle that has at least 2 congruent sides

###
scalene triangle

a triangle with no congruent sides

###
mixed numbers

A whole number and a fraction together.

###
degrees

a unit for measuring angles

###
protractor

an instrument for drawing/measuring angles

###
common denominators

Denominators that are the same

###
international system of units

A REVISED VERSION OF THE METRIC SYSTEM

###
metric system

the basic unitof length in the metricsystemis a meter

###
U.S. Customary System

Units in the U.S.Customary System are not related by the number 10

### Please allow access to your computer’s microphone to use Voice Recording.

## We can’t access your microphone!

### Click the icon above to update your browser permissions above and try again

Example:

### Reload the page to try again!

Reload

## Press Cmd-0 to reset your zoom

## Press Ctrl-0 to reset your zoom

### It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

## Your microphone is muted

### For help fixing this issue, see this FAQ.