maths is rubbish and hopeful you might as well have ebola
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Geometry
Actually, quite a bit. A good gunsmith is usually a skilled machinist, who will use a lot of math.
You can become a math teacher by contacting local schools who offer tutoring to their students. If you are skilled in the subject of math, you can advertise your services on sites like Craigslist. You will also want to get reccomendations from teachers/professors or from past clients.
Abacus. Beads that can be shuffled back & forth on strings in a frame. Can be really effective in the hands of a skilled user.
The ancient Mayans were skilled in math and developed the concept of zero. They had a highly advanced number system and were able to perform complex mathematical calculations. This development of zero greatly influenced mathematics throughout the world.