Students need access to computers for this activity. This activity teaches: eu-, anti-, cal-, mono-, pseudo-, -cide, corp-, dorm-, peri-, epi-, -ure, micro-, macro-, and in-. All of these 14 affix/roots are tested on the Illinois Standardized Test for seventh graders (at least as of 2012).
The following 15-page packet is an interactive, fun, and engaging "scavenger hunt" where students are NOT given the definition of each root/affix to memorize, but, instead, are asked to make knowledgeable GUESSES of the definition. These guesses are based on information gained from words that have the affix/root in it! For each root, I have students answer questions, give definitions, view web pictures, watch short videos or visit websites of 3-6 words with the affix in it - and then, at the end of these searches, they are to guess what the root/affix means.
For example, I have students watch the trailer from Monsters, Inc. where Mike discusses his one eye (monocular), they identify the meaning of monocle, look at monochromatic pictures, look at monorail pictures, etc etc - and then at the end of these searches, they DISCOVER and guess that mono means "one". This makes the learning so much more meaningful and helps to really solidify the meaning in the students' head! I also had students work in partners, so guesses could be made together.
My students loved these searches! And, on top of this, the "hunt" lasts 120 -180 minutes - and it is NOT busy silent work, so it's perfect if you need a 2-3 day break from direct instruction. I have found it to be very effective.