10 heads, 28 legs. How many chickens and rabbits?

Leo asks, Lily answers. Watch two kids talk through a classic puzzle in about two minutes, then try the challenge before the timer runs out.

How to watch

1Tap Start and turn your sound on. Each line is voiced, and the animals act out the math.
2Tap 中 / EN any time to switch language. The voices, captions and problem all switch together.
3Use ◀ and ▶ to go back over a step, or pause and ask your child what comes next.

The trick to rememberPretend they're all chickens. Missing legs ÷ 2 = rabbits.Every chicken you swap for a rabbit keeps the heads the same and adds 2 legs.

Challenge answer (no peeking!)

20 heads, 56 legs: all chickens would be 40 legs, so 16 are missing. 16 ÷ 2 = 8 rabbits, and 20 − 8 = 12 chickens. Check: 12×2 + 8×4 = 24 + 32 = 56.

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Free AI Skill · tested here first

Make an animation like this for any math problem.

This lesson was built with Math Story, a free Skill for AI agents such as Claude Code and Codex. Give it a kids' math problem and it solves and checks the math, writes the two-kid dialogue, voices it in English and Chinese, and builds a page like the one above.

Download the Skill and unzip it into your agent's skills folder.
Ask your agent: “Use math-story to explain this problem: …”
Open the page it builds, or screen-record it as a video.

Download the free SkillFree · ZIP · 22 KB