The largest bills are better to make change.

An important tip is to try to use large bills when making change. It helps prevent you from providing the wrong amount because the more bills and coins, the more confusing to handle the cash. But, always ask your manager beforehand if you can deliver these large bills, such as $20 or $50. In some stores, the rule may vary, so ask the manager to avoid any misunderstanding. When serving the customer, the same thing should happen: always ask if they accept larger bills because many people prefer to walk with smaller ones.

Source: Work - How to Give Back Correct Change https://work.chron.com/give-back-correct-change-22049.html

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