What should i deal with 3 years old girl when she throw tantrums?

The key is to keep calm and show them why it is wrong, rather than focusing on the 'scolding' aspect of it. I know it can be tough to not be angry and frustrated, but remember that two of you being in that state will do nobody any good. Here's a great article that will help you! http://sg.theasianparent.com/ways-to-handle-your-kids-tantrums/