How do I calculate the prices?

I am a developer trying to learn blockchain programming and I am getting a bit stucked when dealing to prices.

I have developed an app that swaps eth for dai in ropsten network using uniswap, but when I get to check the price of eth in dai I get a strange value, 95.9...

Is it beacuse I am in Ropsten teste Network? I can't manage to figure out if it is because of that or If i am doing my calculations wrong, so I'd appreciate any help you guys could give me. The actual line where I check the price of 1 ether in dai goes like this (node.js):

await exchangeContract.methods.getEthToTokenInputPrice(web3.utils.toWei('1', 'Ether')).call()

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Thank you everybody!