The compound machines is the machine which have more than one simple machine. Lighters are the compound machine, scissors are also a compound machine.

The scissors are the compound machines because it have two types of the simple machine which is the wedge, and the lever. The scissor cuts the paper with the parts of the scissor which is sharp and which acts like a wedge.

For the lighters, the lighters are a compound machines because it has two wheels, and a lever. The wheel is the one that helps the stone to scratch with each other and make a hot air. The lever is the one that makes the gas came out by pressing one side of it.

This is a link to a game about compound machine: 

http://www.scholastic.com/play/phone.htm