What was Einstein’s reply to his 8-year-old neighbor, when she naughtily knocked on his door asking him to help her with her math?

"Do not worry about your problems with mathematics. I assure you, mine are much greater." From a review of "Ask Albert Einstein" by Lynne Barasch

Fifteen-year-old Annabel's despair over her math homework inspires her little sister to repay her kindness in teaching her things by getting help from someone else. In 1952 when the story takes place, Albert Einstein was alive and quite famous. The girl writes to Einstein, and he replies, "Do not worry about your problems with mathematics. I assure you, mine are much greater," (which is a real quote of his). Then he gives her a drawing of how to solve the problem. The story is based on Einstein's actual practice of answering school kids' homework questions. Annabel's problem and his solution are included.

http://www.amazon.com/Ask-Albert-Einstein-Lynne-Barasch/dp/0374304351
https://www.thriftbooks.com/w/ask-albert-einstein_lynne-barasch/1361732/#isbn=0374304351

Thank you!But this is another great story, equally funny.

When 8-year-old Adelaide Delong struggled over her addition and times tables, she turned to the one Princeton neighbor she figured could help -- Albert Einstein.

Clutching a plate of homemade fudge and a book of arithmetic problems, young Addie knocked on 112 Mercer St. one day in the 1930s and told the white-haired man who opened the door: "Will you show me how to do my homework?"

The world's greatest scientist could have shooed the little girl off, telling her he was at work on a theory to explain the nature of all physical forces in the universe.

But Einstein didn't do that. Instead, he smiled and accepted Addie's chocolate gift. As gently as he could, he said he would love teach her to add and subtract, but that wouldn't be fair to the other girls at school. And he gave her a cookie in return for her fudge.

Full story here: http://www.capitalcentury.com/1933.html