Work Backwards

Start from the end

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• When the end state is known, work backwards from it.
• Doubling processes: the day before full is half full.
• In take-away games, find the losing positions and steer your opponent into them.

Steps

1. Lily pads
2. The frog in the well
3. Two jugs
4. The half-full jar
5. Out of the well
6. The last coin wins