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People do it a lot of different ways. I suggest having a small bowl or feeder that holds the grit. That way they can control how much grit they get . If you mix it with their food, they won't be able to control the amount as well and it might teach them that grit is food, which it is not.
Throwing it on the floor of the coop would work but most will be wasted.
I personally like to offer grit about day two. If the chicks get nothing but starter mix, they don't need grit, but I always wonder what would happen if a hard-shelled bug or something else got into their area. I don't see that offering them grit hurts anything and is just a little insurance against them eating something you don't know about. Plus you can give them treats if they have grit.
As far as scratch and treats. Scratch is a generic name for grain or mixtures of grains that can be given as treats. It does not give them a balanced diet. They get the balanced diet fromthe starter mix. Treat scratch and treats like you would give a child candy. Only in small amounts after they have eaen their regular food. And don't give scratch to young chicks.
The link below is to the Learning Center which tells you what you can give a chicken for treats. Once they are outside, any of these goes, but while in the brooder, I like to just introduce one treat at a time and see how their system reacts. After a couple of days and they have no adverse reaction, I would introduce another treat and see how that goes. Some treats may give them the runs, but a little loose is better than constipation. Key word "little".
https://www.backyardchickens.com/web/viewblog.php?id=2593-Treats_Chart