.toPrecision not working with pixels

.toPrecision not working with pixels

I am  trying to round a number to integer 
I get a width --> var $h2 = $('.span2').width();

I try ->  $texH = ($h3 / 5).toPrecision(1);

or ->  $texH = ($h3 / 5).toFixed();  

but nothing works I   get 69.05638638638637px   and I want 69px

thanks for helping