The quick term that I use is called using a "screen shot" on the iPad. A screen shot is when you press the home button (the circle at the bottom of the iPad) and the power button (on top of the iPad) at the same time. If your volume is on, you will hear a clicking sound.
Now, to ensure that you can share and collect photos, you need to first make sure that your iPad is configured properly.
Step 1: Create an apple ID. These are free and are used to download apps from the App Store.
Step 2: Enter your Apple ID in the iCloud Settings. You can do this by clicking on "Settings" and then "iCloud." Please note that if you are using a class set of iPads, these settings will have to be enabled on each iPad. If it isn't done on each iPad then the student will not be able to share their work via iCloud.
Step 4: Scroll down under "iCloud" and enable "Photos." Make sure it says "on."
Step 5: Make sure "My Photo Stream" and "Photo Sharing" are both turned on. This will ensure that a photo / screen shot is shared across all devices.
Step 6: Now that you have Photo Sharing enabled, go back to "Photos." If you want, grab 2 iPads to test if it is working. Take a screen shot on one iPad, then, on the other iPad click on "Photos" then at the bottom click "Albums" then "My Photo Stream" You will then see any picture that has been saved or screen shot on any of the enabled devices.
Step 7: At this point, click on "select" at the top right of the screen and choose the pictures that you want to email yourself. When you do this, you will see blue check marks next to each picture.
Step 8: Click on "copy." Although you might be tempted to click on "mail" this feature will not work when trying to send over 10 pictures.
Step 9: Compose a new email to yourself and click on "paste" in the body of the email. Your pictures will then appear. If you have a lot of pictures that you are sending, it may take up to 1 minute for them to all load.
Step 10: Press send. Once you get them to your inbox, you can print them out, etc!