Subtraction. They all want to be size zero.
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Fashion designers need to measure the fabric they use. They use fractions and decimals to figure how much they need.
algebra, calculus, arithmetic, etc.
A peditrician might need to use math to determine the kind of disease for probabilities.
E=mc squared.
Scientists will generally use their brains to solve math or other problems. Once they have established the mathematical formula to be solved, they would use a computer or (scientific) calculator to evaluate the math problem and get a solution.