I am 25 years age now i am doing some works with Women's Blouses,Women's T-Shirts,Totes,Women's Skirts,Women's Tank Tops & Camisoles,Women's Pants,Women's Capes & Ponchs,Women's Vests,Women's Dresses,Women's Shoes,beach bunny Swimwear, I want to how can i know math within my work?Thanks.