RockBlocks

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 17: Elapsed Time — Elapsed Time (3.MD.A.1) — mess around all you want, nothing here saves
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Grade 3, Lesson 17: Elapsed Time

Math skill: Elapsed Time (3.MD.A.1)

How the beat teaches it: Every slot gives a start and end time — figure out how many minutes passed, then build that many in groups of 5, anywhere in the kit, one hit per five minutes gone by.

This is lesson 17 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, “Telling Time to the Minute,” covered telling Time to the Minute (3.MD.A.1). Next is Lesson 18, “Area: Counting Unit Squares.”

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.