###
Addition of integers

even + even = even

odd + odd = even

odd + even = odd

###
Multiplication of Integers

even x even = even

odd x odd= odd

odd x even = even

###
Arithmetic Sequence

an-a 1 + (n-1)d

Ex.

1) plug arith seg and 1st term to n

2) get d

3) plug FIFTH term in n and 5

###
Geometric Sequence

an= a1 r n-1

Example

1) plpug FIFTH TERM in an and FIRST TERM IN N-1 (DON'T MINUS N)

2) get r

3) plug EIGHTH TERN in an and 8 in n

###
Factors

Numbers divided evenly

Ex. 15 is divisible by 5

###
Multiples

Numbers divided by that given number without a remainder

Ex: 8, 16, 24... multiples of 8

###
GCF

Greatest common factor

###
LCM

Least common multiple

###
proportion

two ratios are set equl to each other

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