# of Integers in Interval

To find the number of integers in an interval, simply use the formula below:

Last Number $-$ First Number $+1$

For example, to find the number of integers from $27$ to $84$, inclusive...

$$84-27+1=58$$

NOTE: The word "inclusive" means you include the $27$ and $84$ in the range and the word "exclusive" means you don't. If you see the word exclusive, you would instead do:

$$83-28+1=56$$