PrimeA natural number greater than 1 that has

exactly two factors (or division), itself and 1.Composite

A natural number that is divisible by a number other than itself and 1.

IntegerRational number either negative, positive or zero.

VariableAn alphabetic character representing a number which is either

arbitrary or not fully specified or unknown.GCD

Greatest Common DivisorLCM

Least Common Multiple

Decimals to Fractions

0 . 1 2 3 4 5 6

0.1 1/10 10%0.7 7/10 70%0.01 1/100 1%0.70 70/100 70%0.002 2/1000 2.0%0.078 78/100 7.8%

Tens

Hun

dred

sTh

ousa

nds

Ten-

thou

sand

sH

undr

ed-t

hous

ands

Mill

ions

Terminating or Repeating Decimals

3/5 3 divided by 5 is 0.6 Terminating2/3 2 divided by 3 is 0.6666… Repeating14/99 14 divided by 99 is 0.14141414… Repeating5/36 1 and five thirty sixths is 0.138888… Repeating

Repeating Decimal to Fraction0.33333…

(10)n=0.3(10)

10n = 3.3 -1n = 0.3 9n = 3.0

9n = 3.09 9 n = 3/9 n = 1/3

Arithmetic or Geometric

Arithmetic – a sequence in which each term after the first term differs from the preceding term by a constant amount.Example: 1, 5, 9, 13, 17… d = 5 – 1 = 4Common Difference – a sequence in which each pair of successive terms differs.Example: 1, 5, 9, 13, 17… d = 5 – 1 = 4

Geometric – a sequence in which the ratio of any term to the term that directly precedes it is a constant.Example: 2, 4, 8, 16, 32… r = 4/2 = 2; r = 8/4 = 2; r = 16/8 = 2; r = 32/16 = 2…

Sequence Formulas1. General for the nth terman = a1 ( n - 1 ) d

2. Sum of first n termsSn = __n ( a1 + an )__ 2

3. General or nth terman = a1 r n-1

4. Sum of the First n termsSn = __a1 ( 1 - r n

)__ 1 – r , r ≠ 1