Theory:

When it came to maths, Patrick was out of luck. “What are times tables?” the elf shrieked. “We elves never need that. And addition and subtraction and division and fractions? Here, sit down beside me, you simply must guide me.” Elves know nothing of human history, to them it’s a mystery. So the little elf, already a shouter, just got louder. “Go to the library, I need books. More and more books. And you can help me read them too.”
Explanation:

The elf knew nothing about maths. All concepts of maths were completely new things for him. Patrick was luckless in this matter. The elf said that elves never needed mathematical concepts like addition,subtraction, division and fractions. So Patrick had to sit next to him to mentor him. Even he did not know anything of history, it was completely unknown to him. Thus, he said loudly to him to visit the library, get him more books and help him to read as well.
Reference:
National Council of Educational Research and Training (2006). Honeysuckle. Who did Patrick's Homework - Carol Moore (pp. 7-10). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.