My first 100 line javascript jQuery coding project, feedback please

Hi! I am a core freecodecamp student. Finally I am able to write some long project codes. This is my latest project. A simple addition mathematics game with timer and score. I wrote more than 100 line JavaScript and jQuery code.
this is my project:
I wish three things

  1. Feedback
  2. Please view the source and check my code. Is it improving?
  3. Along with HTML, CSS, JavaScript and jQuery, Now I want to start React, I do not understand this React well. Can any one suggest me to way to learn it?

Thank you very much.

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thx for reminding me that im bad at math. lol nice project

ui needs work though

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@alkapwn3d, thank you very much for your feedback sir.