You can just install google toolbar for check google page rank easily.
If google toolbar is not supporting to your browser you can move on for addons.Most of web browsers have PR checking addons with different features so you can choose better one for your browser.(By adding a toolbar or addons may help you to save your time)
here's my favorite addons for firefox : SEO Status PageRank/Alexa Toolbar
Or just go to a PR checking website and enter the domain name that you need to check page rank.