Much of my son's hands on math is related to legos or video games, rather than baking or board games. He is interested in saving money for things but he'd be annoyed if I tried to make that into a lesson or tried guiding him to figuring it out. He might ask me how many weeks of allowance he needs to save to have enough for a $40 item. I'll answer "Let's see... $5 times 8 is $40. It'll take 8 weeks" rather than "Well, what is $40 divided by 5?" When he asks me a question, he either doesn't know or he thinks he knows but wants to confirm he is right. Sometimes he is cagey about why he is asking and he'll ask something like "what times 5 equals 40?" Hey, look he's asking me an algebra question!
Anyway, I'm not sure how you know if your dc isn't interested in anything math? If you are asking him direct questions or not answering his questions because you are trying to get him to figure it out, he may be acting resistant to that. My guy sure would. And then he'd stop asking me questions, too, because he'd loose faith that I would answer him. He's also very sensitive to other people's agendas. If he thinks I'm suggesting something because I want him to do it, it's a no go.
My answering his questions whenever he asks keeps that trust open and allows him to absorb math concepts and self check his theories in a comfortable way (my ds hates demonstrating any knowledge he isn't very sure about). It's just like how I read things whenever he asked (rather than guiding him to sound them out, a method not suited to his learning style) and he eventually stopped asking because he could read them himself.
I was a little surprised the other day when ds's friend, another unschooler, responded with "I don't do math" when I called a lego brick a 2X4. I didn't feel like I was talking math, lol, just calling the brick by size like we always do. I don't know why that was his first response to hearing numbers, maybe something to do with being previously schooled or having people quizzing him (his cousins do that while knocking homeschooling, I'm told). My ds gets quite a bit of math practice by building with legos.
The other big one for him is computer/video games. So many of them involve accruing points and then buying equipment/weapons, just like having an allowance and spending it. Ds learned place values (10s, 100s, 100s, etc) from these games as well.
I can see another child might make patterns by stringing beads into a necklace. That's math. A young child is doing math when he lines up blocks or toy cars. Even if he isn't counting them, he's seeing how far they stretch, a type of measuring. I really don't understand how anyone can not do math, even if they tried.