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.

🎵 Kindergarten Lesson 23: Counting by Tens — Counting by Tens (K.CC.A.1) mess around all you want, nothing here saves
78 BPM
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Kindergarten, Lesson 23: Counting by Tens

Math skill: Counting by Tens (K.CC.A.1)

How the beat teaches it: Every slot is a counting-by-10s sequence with one number missing — since the missing number itself is too big to build, build how many TENS it is instead.

This is lesson 23 of 24 in RockBlocks Math, Kindergarten, a free course where every lesson turns a math idea into something you can count, hear, and play. The previous lesson, Teen Numbers: Tens and Ones,” covered tens and Ones (K.NBT.A.1). Next is Lesson 24, Shapes: Counting Sides.”

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.