Making Change

A customer buys something and pays more than it costs. Give back the difference using the fewest bills and coins. Tap a denomination to add it to the tray; tap a chip in the tray to remove one. Hit Submit when the tray total matches the change owed. Keyboard users: bills live on the number row (1 = $1, 2 = $5, etc.), coins live on the top letter row (Q = 1¢, W = 5¢, E = 10¢, R = 25¢). ⏎ submits, ⌫ undoes, S skips.

A quick, practical guide to counting change back to a customer — the method actual cashiers use, written for anyone who never learned it or hasn't done it in twenty years. Drill it above, then read the notes below when something doesn't click.

How do cashiers make change without a calculator?

They don't do subtraction. They count up from the price to the amount paid. Handed the change out loud, piece by piece, until the running total hits the tendered amount. The subtraction "$20 − $13.47" never happens — instead you walk from $13.47 up to $20 with the bills and coins in your hand, and whatever you hand out is the change.

What's the rule? (the part most guides skip)

On each step, use the largest coin or bill that still fits without overshooting. Then stop, check your new running total, and pick the largest piece that fits from there. That's it. The reason it works is that US coin values are stacked so each one is a clean multiple of the last boundary: penny snaps to nickel, nickel to dime, dime to quarter, quarter to dollar.

In what order do you count out the change?

Smallest to largest: pennies → nickels → dimes → quarters → dollars → larger bills. You start small because the job of the coins is to get you from the odd-cents price to the next clean dollar; once you're there, bills walk you the rest of the way. Going biggest-first is how people overshoot and have to back out — you commit a five, realize you owed $4.30 not $5, and now you're fishing for 70¢ to take back off the counter.

Walk me through an example: $13.47 paid with $20

A few more: practice these until they're automatic

What do people get wrong when counting change?

• Starting with the biggest piece. Feels efficient, isn't. You'll overshoot and have to back out. Smallest to largest, every time.
• Defaulting to dimes instead of quarters. If a quarter fits, take the quarter — fewer coins, easier to count back.
• Forgetting the pennies. You can't skip from $13.47 to $13.50 with a nickel. Pennies first, every time the price has odd cents.
• Refusing the customer's extra change. Someone owes $12.47 and hands you a twenty plus seven pennies — take the pennies. Change becomes a single clean bill instead of a fistful of coins.
• Not checking the total before handing it over. Count-up is reliable but a quick glance at the tray total catches a dropped coin.

How fast should I be?

A working cashier hits 15+ correct in 60 seconds on Medium. A casual target is 10 in 60 seconds. If you're under 5, the rule hasn't clicked yet — drop to Easy, then watch which denomination you reach for first. It should always be pennies (or, if the price is already on a nickel/dime boundary, the smallest coin that does fit).

When does making change by hand still come up?

Power outages and POS failures at stores. Flea markets and garage sales. Tipping the kid who mows the lawn. Cash-only food trucks. Handing your friend $14.75 for their half of the check without pulling out a calculator. Low-stakes, but the kind of skill that quietly pays off the rest of your life.

Related drills on Practice

Quick Math stacks right on top of this — fast mental addition is what makes count-up feel automatic. Percentages takes the same cents-based mental model into tips, discounts, markups, and sales tax — the moments where "the register does it for me" costs you the most. Tape Measure is the fraction-reading cousin — useful any time a cut list or a DIY project asks for "7 3/8"" and you need to find the mark without stopping to count.

As an Amazon Associate, we earn from qualifying purchases. We only link to things that are genuinely useful for the skill this page is about.

• Counting money workbook Marketed at kids, but the best rebuilder if the skill has rusted. Dollar-and-coin drills, answer keys.
• Cashier drawer practice kit Play money + a tray. Surprisingly effective for a household who wants to run a booth at a yard sale or church fair.
• Calculator watch Not strictly for change — but if the rest of your everyday math needs a bump, a wrist calculator beats unlocking a phone.