If bitcoin is indivisible, where does change come from?
I like to suggest a mental model where the network is a metals forge:

You have a 1 oz gold coin stamped with your key on it, with your transaction you send it to the forge to be melted down and re-formed to two new coins, a .22 with Alice's key stamped on it and a .77 with a key of yours on it, and then the forge keeps the remainder for their fee.

You can't spend half your 1oz coin, but you can have the whole thing melted down into multiple, and perhaps many, parts.