✅ Proof

Showing something must be true, every time, not just this time.

1. Ages 6–8

   • TwoWaysPalsCan you solve it another way?

2. Ages 9–14

   • ProofQuestIs this always true, or just sometimes?
   • MathCircleWhat is your plan before you solve?

3. Ages 15–18

   • Proof SweeperCan you prove this square is safe?

Next idea: 🫙 Estimating →