De-Shi was holding something that looked like a price tag. It had the numbers 024 written on it.
"Isn't that what cows wear as earrings?"
"Yeah," De-Shi said, still inspecting the object, a thoughtful expression on his face, "an ear tags."
I knelt down next to De-Shi. “024. I think it belonged to the cow number 24. You know, from the 30 that jumped.”
Right now I'm only using digits. Should I change some of them to letters? (I always get confused about this. Is there a general rule that tells you when to use letters and when to use digits?)