Maybe the kid is not interested or finds it too difficult.
It could be that the kid has other priorities or just doesn't understand the importance of doing cores. Maybe they were told not to do them for some reason.
It's hard to say exactly. Maybe the cartoon kid is reading a book or painting a picture. There are so many possibilities!
The cartoon kid might be concentrating hard, frowning at the difficult problems.
The cartoon kid might be concentrating hard, with a focused expression on his face.
The cartoon kid might be studying or drawing at the desk.
The kid could be doing various things like reading a book, making a craft, or just daydreaming while sitting at the table. It's hard to say for sure without more details.
The cartoon kid might be playing games on the phone or chatting with friends.
The cartoon kid might be cutting paper or fabric with the scissors to make something creative.
The cartoon kid might be watching TV or just relaxing and daydreaming.
The cartoon kid might be looking for a snack or a drink.
The cartoon kid might be using the cellphone to play games or chat with friends.