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Bill Buchanan
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## Setting up your Ethereum wallet on Ropsten
The Ropsten network allows a user to test an Ethereum application, and using free Ether. Initially setup your MetaMask wallet.
* What is your public ID?
* Find out someone else's public ID, and send them 0.001 Ether.
* Can you see the transaction on
* Can you see your transaction on the other person's wallet?
## Creating a Smart Contract in Ethereum
So, let’s write a bit of code that does some simple maths. In the following we will implement sqrt(), sqr(), mul(), sub(), and add():