First step is login to your wordpress account. When you inside your dashboard, try to find tools tab and choose export. You will see page like this picture below.
Now we login to our blogspot and choose settings tab. You will see blog tools there, give you 3 option, import, export, and delete blog. You know what to do here, click import blog and you will see this
http://wordpress2blogger.appspot.com/You will see a set of instruction how to convert it. When you finish convert your xml file, you can put it now on import form from blogspot. For your information, you only have your post only without pages from wordpress. I think it because blogspot not support pages. Happy blogging.
Wait a minutes, what about blogspot to wordpress? How to do that? It's a simple step to do it. Open your wordpress dashboard, find tools tab and choose import. You will see like this picture