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.

🎵 Grade 2 Lesson 21: 2D and 3D Shapes — Shape Attributes (2.G.A.1) mess around all you want, nothing here saves
88 BPM
Loading drum sounds…
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
4/4 ×2
🎯 Lesson: 0/4 · 🥁 0 solved · 0 badges

Grade 2, Lesson 21: 2D and 3D Shapes

Math skill: Shape Attributes (2.G.A.1)

How the beat teaches it: Every slot is a shape — count its sides, angles, or faces, and build that many hits.

This is lesson 21 of 23 in RockBlocks Math, Grade 2, a free course where every lesson turns a math idea into something you can count, hear, and play. The previous lesson, Picture Graphs and Bar Graphs,” covered reading Graphs (2.MD.D.10). Next is Lesson 22, Partitioning Rectangles: Rows and Columns.”

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.