• Numbers we think of when we think of numbers; positive or negative. 
• Zero is an integer.

• 2 = Hundreds digit
• 4 = Tens digit
• 6 = Units/Ones digit

• 2 = Tens digit
• 7 = Units/Ones digit
• 6 = Tenths digit
• 3 = Hundreths digit

Integers listed in order of increasing size without any integers missing in between. 

• Positive integer that can be divided evenly only by two numbers: itself and 1.
• 2, 3, 5, 7, 11, 13
• 2 is the smallest and only even prime number
• Neither 0 or 1 is a prime number
• All prime numbers are positive (no negatives)

• When a number can be evenly divided by another number = divisble

Its units digit can be divided evenly by two. 

Example: 772 is divisible by 2. 

The sum of its digits can be divided evenly by 3.

216 = 2+1+6= 9

9 is divisible by 3, so 216 is divisible by 3

The number formed by its last two digits is divisble by 4.

3,028 --> 28

28/4 = 8, so 3,028 is divisible by 4

It is divisble by both 2 and 3, the factors of 6.

318 is even, so it is divisble by 2.

318 = 3+1+8 = 12

12 is divisble by 3

A number is a factor of another number if it can be divided evenly into that number. 

Factors of 15 = 1,3,5,15

A number (x) is considered to be a multiple of another number (y) if y times another integer equals x.

15 is a multiple of 3, since you can multiple 3x5

I would consider this like a "product" of a number

"Factors are few, multiples are many"

• Distance between a number and zero
• Always postive
• -5 = 5
• 6 = 6
• Expressed as a the number sandwiched between two lines l6l

Please  - Parentheses

Excuse - Exponents

My       - Multiplicaiton

Dear    - Division

Aunt    - Addition

Sally    - Subtraction

The Distributive Law means that you get the same answer when you multiply a number by a group of numbers added together as when you do each multiplication separately.

a(b+c) = ab + ac

Another way of expressing division. 

1 over 2 = 1 divided by 2

Part/Whole

7/10 = 7 parts out of a total of 10 parts

Add: Simply add the nemerators and place them over the common denominator

1/7 + 5/7 = (1+5)/7 = 6/7

Multiple the numerator and denominator of each fraction by a number that will give it a denominator in common with the others

1/2 + 2/3 =

1/2 * 3/3 + 2/3 * 2/2

3/6 + 4/6 = 7/6

Just multiply the numerators and put the product over the product of the denominators

2/3 * 6/5

Just multiple 2*6 = 12

3*5 = 15

12/15

Find a factor of both the numerator and the denominator.

12/15

4*3 = 12

5*3 = 15

Remove the number in common (3)

and you just reduced your fraction to 4/5