Play it · Ages 14–15
Prove That √2 Is Not a Fraction
Build the argument, one line at a time. Three challenges — each one changes what you have to do, not just how many of it there are. Nothing is timed and nothing is scored.
0 of 3 solved
Put the seven lines in the order that proves it.
Each line has to follow from the one before. Order is the whole thing.
The proof
To prove: √2 cannot be written as one whole number over another.
- Tap the line the proof has to start with.
Lines to choose from
Ten minutes of stuck counts as the work.
Now do it away from the screen
The board is the warm-up. The year page has the same problem on paper, the hint ladder, the answer, the five-day week and three questions nobody can mark — which is where the twenty-five minutes actually go.