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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.
The math is wrong for this problem. But, so is yours. 5x5 becomes 5 1x5 pieces with 4 cuts. Then 4 cuts for each of the 1x5's to create 25 1x1's. 20 cuts total.
Yes! Came here to say this. The math is wrong on this!