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A number can be divided by 2
if last digit is even (0, 2, 4, 6, or 8)

A number can be divided by 3
if the sum of the digit is divisible by 3

A number can be divided by 6
if the number is divisible by both 2 AND 3

A number can be divided by 9
if the sum of the digits is divisible by 9

A number can be divided by 5
if the last digit is 0 or 5

A number can be divided by 10
if the last digit is 0

A number can be divided by 4
if the last two digits are divisible by 4 (not always true)

A number can be divided by 8
if the last three digits are divisible by 8

Mode means
the number that occurs most often

Range
The largest number minus the lowest number

Median
The number that falls in the middle of the data set. The data set is arranged from least to greatest or greatest to least to highest number; i.e. 47, 78, 78, 82, 88, 100, the median would be 80

Average
Add numbers and divide by how many numbers there are.

