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'Move Those Halves' printed from https://nrich.maths.org/
Here's a green A4 sheet and its two halves which are see-through orange and blue sheets.
Explore where you can put these two halves and look at the overlap and the uncovered green parts.
There are no particular rules, it's just a matter of having an A4 sheet and the two transparent A5 sheets.
What different shapes and areas can you discover?