If you would like to create QR codes for your class here is a workflow that works for me.

ShortenMe

Using the Chrome web browser install the ShortenMe chrome extension. Click Here

What this extension allows you to do is create a short URL and a QR code from any website.
shortenme qr code

 

Google Slides

Create a new Google Slides presentation from Google Drive. Choose a white presentation. Since I am going to print the slides, I choose the slide size to be the “Standard 4:3”
Google Slides Standard Size

 

Blank Layout

I am going to make each slide a large QR code. Choose the blank layout for each slide.

Websites

Go to the websites you want to direct your students to via QR code. Oftentimes this is a  YouTube video with basic skills tips or advanced tips to extend the learning.

Click on Extension

The ShortenMe Chrome extension looks like 3 dots. You will find this to the right of the Omnibox.
shortenMe

Click on the QR Code

By default the short URL will be copied to your clipboard. You need the link to the QR code. Clicking directly on the QR code does not copy the image of the QR code, but rather the URL to the image.
shortenme qr code

Insert Image

Back in Google Slides, use the insert menu to insert an image.
Screen Shot 2014-10-30 at 11.41.52 AM

By URL

Rather than uploading an image, choose the “By URL” option along the top of the insert image screen. Paste the URL that was automatically copied to your clipboard into the input box.
Insert image by URL Google Slides

Resize QR Code

The QR code will be small on the slide. Use the image resizing handles to allow it to fill the entire slide.

Insert Blank Slide

Insert a blank slide in the Google Slides presentation and insert another QR code. Repeating the process of going to the website, clicking on the extension, clicking on the QR code, inserting image by URL in Google slides allows you to quickly create a collection of QR codes.

Print

QR codes are made to be printed. They allow mobile devices to scan and link to a webpage or information. Print the Google Slides presentation and make these QR codes posters on the wall.