Stock percent decrease and increase

This might sound like a stupid question. I am new to investing and I'd like to apologize for not reading through all the materials first but I just want to clarify this one thing.

If a stock goes down 10 %; let's say it was 100k euro for the sake of simplicity and after the 10 % decrease, it's now 90k euro and then it goes back up 10 %, it will now be 99k euro, right ?

So, if the market drops a significant amount, it will have to rise more than the value it dropped by to simply break even ?

Thanks in advance !