Limit calculation output

Hello,

I'm a PHP newbie, but like to learn..

My question is how do I limit a calculation output in the following
code:

<img src="images/health/<?=round(( $number1 / $number2 ));?>.png"/>

I need a php code that prints out 10 for numbers that are higher then
10..

So if the result would be 86, php will print 10...

Thanks!
/Xafke