Circle Graphs

-Sectors of circle graphs are made from central angles

-If the sector covers 25% of the graph, the central angle is 25% of 360 (degrees) . Which is 90 (degrees).

Circle Formulas

c = (pi) d

c = 2 (pi) r

d = 2r

A = (pi) r2 

Area is the measure of space a 2D shape covers. 

Divisibility Rules

0 = ends in zero
1 = all numbers
2 = even numbers
3 = sum of the digits is 3
4 = divisible by 2 twice
5 = ends in a 0 or 5
6 = divisible by 2 and 3
8 = divisible by 2 thrice
9 = sum of the digits is 9
10 = ends in 0

Integers

Integers 

Negative numbers represent values below
zero and positive numbers represent
values above zero

eg. above and below ground or sea level

1+ (-2) = (-1) is an addition statement

3 - (-1) = 4 is an subtraction statement

Intergers

Opposite integers have the same numeral
but different sing eg. 3 and (-3)

know what a (+) + (+) =       (+) - (+) =
                     (-) + (-) =        (-) - (-) =
                     (+) + (-) =       (+) - (-) =
                     (-) + (+) =       (-) - (+) =
                     

Divisibility

Definition:


Divisible-  Means when a number can be divided by another number, with no remainder or decimal.


(It's a whole number.)

Probability

DEFINITIONS: 

Experimental probability:  Actually doing the trails

Theoretical probability:  what you expect to happen