Below are two TI-Nspire documents from Spencer Williams that show visually the operations of adding and subtracting fractions. There is also a pdf file to support the use of these in the classroom. Thanks, Spencer, for sharing these.
Ancient Egyptians knew fractions like 1/2 or 1/4 ((one piece of a pie).
For some reason, they never repeated the same fraction when adding; ie they never wrote: 1/4 + 1/4 + 1/4 = 3/4
This website presents a range of Egyptian maths problems for you to solve. Good luck!
To play this one-person game well, students need to work with equivalent fractions, and be able to add and subtract fractions. Don't forget to turn the sound on!
Here is a neat two-person version of the game.
And here is the above game without all of the instructions:
Virtual fraction bars. They can be used to teach or reinforce fraction concepts such as equivalent fractions, or addition and subtraction of fractions.