5c is our smallest coin in Australia so all transactions work this way.

If I have to use up some cash at a self serve machine but I don't have enough to cover the whole thing, when I do the debit card portion of my split payment I make sure to leave 2c extra.

So if it's $12 and I have to use up a $5 note I'll split pay $6.98 on my debit, the machine will ask for the other $5.02 and will round down when I put in the $5 note.

No I don't actually care about the 2c but I'm having to type in a split pay number regardless so figure why not.