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Grade 1 Math · Level 5, Puzzles & Patterns

Sequential Constraint Logic

How the lesson starts: Sequential Constraint Logic

1. Percy's snow day

   Hi friend! Meet Percy the penguin. It's a snow day! Percy needs socks and boots. Boots first? Then the socks won't fit! Some things must go first.

2. Arrows mean before

   In puzzles, friends wait in line. We draw an arrow between them. The arrow goes from A to B. That means A goes before B.

3. Who goes first?

   Two arrows now. A goes before B. A goes before C. Who must go first? Nobody goes before A. So A goes first! Watch out! Look for the one with no arrow coming in.