To find some juicy math questions, you'll need to explore the "Topic" pages.
Just hit the "topic" icon on the top of the page, then use the menu on the right-hand side to navigate deeper.
You'll need to to follow this path:
Topics > Education > Subjects > Mathematics
A shortcut you could use is to simply type the word "mathematics" into the search bar at the top of the page.
Once you're in the Maths section, make sure to use the "follow" button on the page. This will make sure that every time a new math question is asked, it will come up in your home feed automatically.