Adding / Subtracting / Dividing Custom Field values

I was trying to quickly create a way for me to construct an or for YouTube or Vimeo additions to my post. I got it to work doing this:

<?php <br />	// you might want to check the aside as it might need a calculation after creating variables.
// make sure that advanced custom fields is installed
// (nab the width and height for embedding)
$video_h = get_field('video_h');
$video_w = get_field('video_w');

// (nab the videos id of origin)
$vimeo_id = get_field('vimeo_id');
$youtube_id = get_field('youtube_id');
$facebook_id = get_field('facebook_id');

// check for vimeo first
if(get_field('vimeo_id'))
{
echo '	echo '?title=0&byline=0&portrait=0&color=ff0179"' . 'width="' . get_field('video_w');
echo '" height="' . get_field('video_h') . '" frameborder="0" webkitAllowFullScreen mozallowfullscreen allowFullScreen>
';
} elseif (get_field('youtube_id')) // then youTube
{
echo '	'" src="https://www.youtube.com/embed/' . get_field('youtube_id') . '" frameborder="0" allowfullscreen>';
} elseif (get_field('facebook_id')) // then Facebook
{
echo '	'" " /> ';
}

?>

But now I want to create an aside post format that basically reduces that embed by either a 1/3rd or 1/2. I looked through basic php and found some basic stuff that led me to believe this might work:

$video_h = get_field('video_h')/2;
$video_w = get_field('video_w')/2;

// (nab the videos id of origin)
$vimeo_id = get_field('vimeo_id');
$youtube_id = get_field('youtube_id');
$facebook_id = get_field('facebook_id');

echo $video_h;
echo $video_w;

This returned: 00