Practice is just practice. There is nothing to that but time and energy.
But most cashiers I've worked with, use grouping to help makes things faster.
When counting change for a customer, the moment you see the total, take out the dollars and the quarters. When I see, 3.87$ as change. I'm already picking up the 3 dollars, and the 3 quarters in my hand, and as I'm doing that the only change I'm 'figuring out' is the .12$. One dime and 2 pennies.
Just count up from quarters. Even aloud. If you see 7.64. Take your seven dollars and two quarters and say “7.50” and then count aloud the rest of the change: one dime “7.60”, plus four pennies “7.61,62,63… 7.64 total.” Many customers really appreciate hearing their change announced out loud and don’t mind you counting it.
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