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 3 Lesson 21: Liquid Volume and Mass — Liquid Volume and Mass (3.MD.A.2) mess around all you want, nothing here saves
96 BPM
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Grade 3, Lesson 21: Liquid Volume and Mass

Math skill: Liquid Volume and Mass (3.MD.A.2)

How the beat teaches it: Every slot adds or compares liquid volume or mass in whole units — build the total in quarter notes, one per unit.

This is lesson 21 of 24 in RockBlocks Math, Grade 3, a free course where every lesson turns a math idea into something you can count, hear, and play. The previous lesson, Perimeter,” covered perimeter (3.MD.D.8). Next is Lesson 22, Picture Graphs and Bar Graphs.”

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.