3rd Grade · Ages 8–9
The Backwards Year
Eight is when a child can hold a plan in their head — and the lesson of the year is that the best plan sometimes moves away from the goal.
- 1 Hard Thing
- 5 days · 105 minutes
- 3 unmarkable questions
Ready?
3rd Grade · The Two Jugs
Eight is when a child can hold a plan in their head — and the lesson of the year is that the best plan sometimes moves away from the goal.
Full screen — no distractions
Where this goes
The ladder
The same idea, three times, roughly a year apart. This is what depth looks like from the outside.
This year
5 and 3, by hand.
Next year
Any pair of jugs, and the rule that decides what is reachable — every amount is a multiple of the biggest number that divides both.
The year after
That rule under its real name: the greatest common divisor.
What lives on the desk this year
- Two jugs — actual ones
- A sink you are allowed to waste water in
- Paper for writing the move list down
- A timer you set yourself
- A shelf for the puzzles you have not cracked yet
The rest of 3rd Grade
One hard thing a day is the sharp end. It sits on top of an ordinary year.
Last updated: September 2026