Number shape cakes are popular for for younger kids but good for any age. Here's how to cut the cakes to make the numbers you want using everday, house hold items.
You will need two round cakes. Place a round object in the middle of the cake. I've used a glass in this example.
Using a small serrated knife, cut around the object.
Carefully remove the centre piece and repeat with the second cake.
Cut the pieces out as shown in this picture.