150 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: Multiply Two Complex Numbers (N-CN.A.2)
How the beat teaches it: Every slot multiplies two complex numbers using FOIL, remembering i² = -1 — combine the real parts and the imaginary parts. Build the real part on the bass drum and the imaginary part's coefficient on the snare.
This is lesson 10 of 24 in RockBlocks Math, Grade 11, a free course where every lesson turns a math idea into something you can count, hear, and play. The previous lesson, “Adding and Subtracting Complex Numbers,” covered add or Subtract Complex Numbers (N-CN.A.1). Next is Lesson 11, “Quadratics with Complex Roots.”
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.