"Yeah, I could definitely imagine so. But if you're not in a rush, don't be afraid to ask me for help again in the future." He gave her a smile, straightening up. "I'm not Junior Woodchuck Jamboree Math Champion two years running for nothing."

Sure, that one wasn't particularly complicated, but it could still probably trip one up if they weren't good at math and were busy and not paying attention, he supposed.