SUMCafé Crumb, a percentages and fractions game behind a café counter
A free café maths game. Pour drinks by percentage, cut cakes into fractions, then count the change or tap the card. No ads, no download, plays in the browser.
Play in your browser, free
- Genre
- Percentages, fractions and money
- Skills
- Percentages, fractions, ratios, giving change
- Ages
- 8 to 14
- Plays on
- Browser, Chromebook, tablet, phone
- Price
- Free, no download
- Updated
- 18 Oct 2026
Every customer at the counter orders a little maths problem. A latte that's 75% milk? Pour until the line hits three quarters, and not a drop over. Half of a cake cut into eight? That's four slices on the tray. Get it wrong and the customer notices.
Then they pay. Cash customers hand over a note and you count their change back in real Australian notes and coins, right down to the five cent piece. Card customers need the total keyed into the reader, so the order has to be added up properly first.
The days build slowly. Toast orders turn into groups (“three of us, two slices each”), cakes come out as “what's left of this one”, drinks start asking for ratios, and discounts knock a percentage off the bill before you work out the change. Phone orders ring in from Day 2, and every so often a rush hits.
The maths isn't a quiz stapled onto a game. It's the whole job. You can't serve anyone without working out what they actually asked for.
How to play
- Read the ticket. Each item says how much, how many, or what fraction.
- Make each item at its station: Drinks, Cake, Toast and Food. Put each one on the tray.
- Head to the Register. Cash customers need exact change counted out; card customers need the total keyed in.
- Phone orders ring first. Answer the call to hear what they want.
- Perfect orders build your combo up to x5. Run out of hearts and the café closes.
Controls
| Tap, click or hold | pour, slice, toast and plate |
| Number keys 1 to 5 | switch station: Drinks, Cake, Toast, Food, Register |
| H | show a hint (costs a little bonus) |
| A | answer a ringing phone |
| 0 to 9, then Enter | key the total into the card reader |
| P or Esc | pause |
| F | full screen |
A few tips
- Tap a pour button for exactly 5%, or hold it to pour faster. On ratio and fraction drinks the cup is marked in equal parts and each tap pours one part, so 1 : 3 : 4 is one tap, three taps, four taps.
- 25% is a quarter, 50% is a half and 20% is a fifth. Most drink and cake orders are one of those in disguise.
- Discounts come off before you work out the change, so read the bill before you open the till.
- Hints cost a bit of bonus, not the order, so use one rather than guess.
- Spend your Café Cash. Every upgrade and every new menu item raises your café rating, and each star adds 10% to the score of every order.
What it practises
- Percentages of an amount
- Fractions of a whole, including “what's left”
- Ratios (one part coffee to three parts milk)
- Multiplying and dividing in equal groups
- Money: adding up, discounts and giving change
Is it really free?
Yes. Café Crumb runs in your browser, there's nothing to download, and there are no adverts anywhere. Make a free account and it'll save progress and throw in the starter worksheet pack. Paying lifts the daily play limit, and that's all it does. You can't buy your way to being better at the game.
More games
Printable worksheets too
For practice away from the screen, these grades cover the same skills: grade 4, grade 5, grade 6, grade 7, grade 8. Every sheet comes with the answers. See all twelve grades.
Is it safe for kids?
No adverts, no links out of the game, and no chat with strangers. The Café Cash you earn buys upgrades and new menu items inside Café Crumb, like a bigger tray, a faster toaster or a mocha. You can't buy it with real money and it doesn't do the maths for you.
Will it run on a school Chromebook?
It should. There's nothing to install, and the café rearranges itself to fit, so Chromebooks, iPads and phones all work, in landscape or portrait. There's a full screen button for small screens, and progress follows the account rather than the device, so a kid can start at school and pick it up at home.