These are some simple but very useful fraction diagrams.
Update: Now in red, green, blue, amber, cyan, orange and yellow organized by denominator.
Another Update: Now with division diagrams.
If you like my massive sets of diagrams and need something new, let me know. It's probably something I'd like to make anyway.
Free for classroom use, but please buy the pay version for commercial use, or if you would like to thank me for making the diagrams.