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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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You should add fixed tests in the test cases.
Rounding is bad practice, but more importantly this is a dupe: https://www.codewars.com/kata/5419cf8939c5ef0d50000ef2
It's easy to hardcode results with these tests.
The expected format isn't specified (precision, rounding direction).
My first own kata, it is test only.
There are a lot of katas about simple arithmetic and string formatting, nothing new here.