Here are some things that weigh approximately 10 grams in a classroom:

* Paperclip: A standard paperclip usually weighs around 10 grams.

* Pencil: A typical pencil can weigh around 10 grams.

* Small eraser: A small eraser, about the size of a quarter, could weigh about 10 grams.

* Small ruler: A short ruler, about 15 centimeters long, might weigh close to 10 grams.

* Crayon: A single crayon can weigh around 10 grams.

Note: These are just estimations, and the exact weight might vary depending on the specific object and its size.