Inference Listening Lesson - It's too Hard!

What subject is Billy having trouble with?

Reading
History
Math
Writing

A: What's wrong, Billy? Do you need help with your homework?
B: I can't solve this problem. I'm terrible with numbers. I never get the right answer.
A: Let me help you. You just need to read the question carefully. Should you add or subtract to get the answer?
B: I hate this subject. I'd rather read a book.