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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.
A multiplication and a division are a mighty thin task to build a kata out of. Consider unpublishing this task and getting more better inspiration.
The result should not be an integer. Read documentation on why rounding is bad, and how to do it instead.
Feels like a duplicate.