Leaderboards
When a real round overflows, post your quotient count under a nickname. There is a board for each fact set, and each keeps the 100 highest counts of the day, the week, the month, and the year. A nickname is all you need; a state or country is optional, and the game never asks for a real name, a town, or an email address. Practice rounds stay on your device.
Top 100 rounds on the 2 to 9 division facts, most bubbles popped first. Resets at midnight, US Eastern time.
No rounds on this board today yet. Pop some bubbles and post the first score.
How to Play
Choose the facts, 2 to 9 for the smaller table or 1 to 12 for the full one, and press Play or the Enter key. Seven bubbles float up, each showing a division fact, and the water starts to rise. Only one of them glows: the oldest bubble still floating. Type its quotient on the keyboard or the on-screen keypad. There is no Enter key between answers; the game judges what you typed the moment it has as many digits as the glowing fact's answer. Get it right and the bubble pops, the water drops a step, and the glow moves to whichever bubble has been waiting longest. Get it wrong and the water rises instead, but the same bubble keeps glowing until you answer it correctly.
Here is exactly what to type. Each key below is one press.
One digit. The bubble pops the instant you press 8.
Two digits, only with the 1 to 12 facts. Press 1 then 2; the pop lands on the 2.
One digit, and wrong. Six is not the quotient of this fact, so the water rises a little and the streak resets; 45 ÷ 9 keeps glowing until you press 5.
- Drain the tank to clear a stage
Answer quotients faster than the water rises and the level drops to the floor. The plug opens, the tank empties, the stage is cleared, and it refills a little higher with a faster pump.
- Three in a row drains the tank
Answer three glowing bubbles without a miss and the water drops an extra step with a swirl. A wrong answer adds a splash of water and starts the count again.
- The golden bubble
Once you have popped a few, a golden bubble appears now and then. Answer it while it glows and every bubble in the tank goes with it.
- The water speeds up
An untouched tank overflows in about half a minute, and the pump gets faster the longer you last and with every stage, so every round ends. The score is what you popped before it did, and how many stages you cleared.
Why the Bubble Glows
Multiplication's Bubble Tank lets a player pop whichever floating fact they know, because two products almost never start with the same digit. Division quotients only run from 2 to 12, so with seven bubbles afloat, several would often share a first digit, and a fast guess could pop the wrong one before the game could tell which fact you meant. Division Bubble Tank sidesteps that by asking for one fact at a time: the oldest bubble in the tank glows, and only that answer is judged.
That rule also decides the order a learner works through the tank. A hard quotient cannot be skipped in favor of an easier one floating beside it; it has to glow and be answered, or wait its turn while the water climbs. The rising water is still the pressure, but the glow decides which fact it is pressure on.
Keyboard, Keypad, and Sound
On a computer, type with the number row or the numeric keypad. Each physical key press lights the matching key on the on-screen keypad, so a child watching can follow along. On a phone or tablet, tap the on-screen keypad; it is the same one Math Builders uses during practice, so a learner who already uses the app needs no explanation. The game never opens the phone's own keyboard, so the tank stays visible while you type.
The sounds are short and watery: a bright blip for a pop, a rising run for a golden bubble, a gurgle for the drain, a low tone for a miss, a tick when the water nears the lid, and a low double note for the overflow. The speaker button on the card turns all of them off, and the choice is remembered on that device. Nothing plays until you press Play, so the page is silent on load.
Using Division Bubble Tank in Class or at Home
On a projector, the tank reads easily from the back of the room, and the single glowing bubble makes it a fair call-out game: one student holds the keyboard, the rest of the class calls the quotient they see glowing. Practice mode with the 2 to 9 facts is a calm way to introduce it; the full 1 to 12 set with the water on is where a class that already knows its division facts goes for a high score.
Division Bubble Tank is a game, not a diagnostic. It rewards knowing which quotients are already fast for you; it does not tell you which ones are slow on an ordinary day. For that, use division facts practice, which flags the facts a learner keeps hesitating on, or work through a printable set from division worksheets first. A child who keeps leaving the same bubble glowing until the tank overflows benefits from a closer look at what division fact fluency means before coming back to the tank. The game works alongside that practice; it is not a replacement for it.
Division Bubble Tank is the same game as multiplication's Bubble Tank read the other way round: the same tank, the same duck, the same stages, but every fact runs backward through the table instead of forward. See both, along with every other game, on the division games hub or the full free math games catalog.
Frequently Asked Questions
Drain the tank. Answer quotients faster than the water rises and the level drops all the way to the floor; the plug opens, the tank empties, and the stage is cleared. It refills a little higher with a faster pump and the next stage begins. Every round ends with an overflow eventually; your score is the bubbles you popped and the stages you cleared.
Only the oldest bubble still floating, the one that glows. Division answers run from 2 to 12, so several bubbles could easily share a digit; rather than guess which one you mean, the game asks for one quotient at a time. Pop the glowing bubble and the glow moves to whichever bubble has been waiting longest.
The water rises a little and your three-in-a-row streak starts over. The glowing bubble keeps glowing; backspace removes a digit before the answer is judged, and a wrong answer is only judged once you have typed as many digits as the quotient has.
A rare bubble that shows up once you have popped a few. Answer it while it glows and every bubble in the tank goes with it, and each one counts toward your score.
The tank is closed with a glass lid, and a rubber duck floats on the surface. As the water rises the duck rises with it toward the lid, and the edges of the tank glow red. If the water reaches the lid, the duck goes under and sinks to the bottom upside down, and the round is over.
Yes. Turn on Practice before you press Play. The water rises at about a third of the pace and never reaches the lid, and you end the round yourself with the flag button whenever you like. Practice rounds are never posted to a leaderboard.
After a real round overflows, post your quotient count under a nickname and, if you like, your state or country. There is a board for each fact set, keeping the 100 highest counts of the day, the week, the month, and the year in US Eastern time. Nicknames go through a word filter, and the game never asks for a real name, a town, or contact details.