145 BPM
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4/4 ×2
Drag rhythmic values into up to 8 beat blocks per line to build a drum groove, or click a tile then click a block to place it — handy on a trackpad.
Math skill: Find the Number of Edges in Kₙ
How the beat teaches it: Every slot gives n, the number of vertices in a complete graph (every pair connected) — the number of edges is n(n-1)÷2. Build that many notes anywhere in the kit.
This is lesson 16 of 24 in RockBlocks Math, Discrete Math, a free course where every lesson turns a math idea into something you can count, hear, and play. The previous lesson, “The Handshake Lemma,” covered find the Sum of Vertex Degrees From the Edge Count. Next is Lesson 17, “Edges in a Tree.”
Every slot above (A, B, C, D) is its own question, and it’s a real, blank RockBlocks beat the whole time — the same drag-and-drop tiles, kit, tempo, sheet music, and drummer view as anywhere else on the site. Tap ❓ Questionin the corner to read the current slot’s problem, build your answer right in the grid, then tap ✓ Check Answerto grade it. Once you’re done, keep going: expand the beat, drop it into a Stack, or save a copy to your own page — nothing here overwrites the lesson itself, so every visitor still starts from the same blank slots.