## arithmetic refresher

*November 10, 2019*

Some notes on integers that I learnt today.

Integers

Integers are numbers you count with (hence fractions and roots cannot be integers)

Even integer - divisible by 2

Odd integer - not divisible by 2

prime - divisible by 1 and itself (1, 3, 5). They have to be greater than 1.

./ #star 2 is the only even prime number

0 - is the only non negative, non positive integer

./ #star Non integer value cannot be determined as odd or even

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Factors

are positive integers that make up a number evenly. (finite)

Multiples

integer divisible by another integer (infinite)

Remainder

Left over after dividing two numbers. Will always be smaller than the number being divided by.