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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.
Took me a while to figure out how NOT to do brute force
You just need to be able to divide the number in 2 portions that are even. The parts does not have to be equal.
For 90 you can devide in many even parts, one example is 80 and 10.
For 10 you have 2 and 8 (and also 4 and 6)