ALL DIVISIBILITY RULES

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

PROBABILITY

What is the probability if i were to land on mortage and then roll a six sided die and get a 6

A.)75 percent

B.)60 percent

C.)61 percent

D.)65 percent

E.)67 percent

ANSWER E.)

NEGITIVE WITH NEGITIVE INTEGERS

Negitive integer are little bit harder than positive with positive intergers.The only thing different is that you would have to swap the integers around and then you would be able to turn in into a positve instead of negitive.

EXAMPLE:

(-9)-(+8)
(+8)+(-9)=-1

POSITIVE WITH POSITIVE INTEGERS

Just like adding regular numbers.

EXAMPLE


(+9)+(+8)=+17


(+6)+(+12)=+18

HOW TO GET FROM DECIMAL TO FRACTION TO PERCENT

YOUR DECIMAL IS 693

693x100=69300

percent is 69 because i rounded off the extra number 3 to 0 and just used the first 2 numbers.

fraction is 69/100

because if you have your percent you automaticaly have your fraction. 69 percent and 69/100

ANGLE BISECTOR

If you get an angle of 60 degrees and you find the angle bisector the other angles will be 30
 degrees.

60 divided by 2= 30

THE OUTLIER

OUTLIER- Values that are too big or too small compared to the other values.

EXAMPLE

98,45,23,12,56,34, and 29
Oulier is 98

THE RANGE

RANGE- Positive difference between largest and smallest values.

example

2,4,1,6,7,4, and 6

7-1 = 6

THE MODE

MODE- The value that shows up the most

e.g.

2,2,2,4,5,6,6 and 3

2 is the mode cause it shows up the most.

MEDIAN-The middle number in a set of ordered values, might be the median of 2 middle values

e.g.

10,9,8,7,6,5,4,3,2, and 1

The answer is in between 6 and 5.

The median is 5.5

THE MEAN

MEAN- Add up all values divide by how many values there are.

8,7,6,5, and 4

8+7+6+5+4 divided by 5 = 6

So the mean is 6

variable- A letter that represents an unknown number

Times 11 trick

If someone gives you a question like 63 times 11.
The first number will always be the same 6.
Then you add 6 plus 3 = 9 and then the 9 will be your middle number. Then the last number will always be the same as well 3.
So your answer is 693

Rule for 2

Rule for 2

All even numbers are divisible by 2.

even numbers can end with 0,2,4,6,8 and

odd numbers can end with 1,3,5,7, and 9.

order of operations

B - brackets
E - exponents
D - division
M - multiplication
A - addition
S - subtraction