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You could try putting one piece in to start with and then seeing whether you can place another piece next to it.
The interactivity gives all the pieces in the correct orientation so you might like to use it to try out your ideas. If you would prefer to use cut-out pieces, you could check which way up each small triangle goes by looking at the interactivity.
What is the greatest number of squares you can make by overlapping three squares?
Find all the numbers that can be made by adding the dots on two dice.
Andrew decorated 20 biscuits to take to a party. He lined them up and put icing on every second biscuit and different decorations on other biscuits. How many biscuits weren't decorated?