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When children initially learn addition, subtraction, multiplication, and division, they begin by performing operations on two numbers. But what happens when an expression requires multiple operations? Over time, mathematicians have developed a set of rules called the order of operations to determine which operation to do first.

There are actually thousands of different jobs that require some knowledge of mathematics. Here are more than 30 firsthand accounts from Mathematicians at Worktelling what some college math majors are doing, from an Air Traffic Control Systems Analyst and a Lawyer to a Data Capture Facility Troubleshooter on the Hubble space telescope.

Exactly How Is Math Used In Technology?, from the Mathematics Department of the British Columbia Institute of Technology, provides examples of math uses for biomedical engineering, food technology, building technology, chemical sciences, civil and structural engineering, graphics and computer-aided drawing (CAD), electronics, environmental health, mechanical engineering, mining technology, nuclear medicine, occupational health, petroleum technology, prosthetics, forestry and wildlife, robotics, and surveying.

Examining How Mathematics is Used in the Workplace, by Annie and John Selden for the Mathematical Association of America's Teaching and Learning Research Sampler, provides abstracts of studies on how much mathematics is used in various occupations: Mathematics in Automobile Production; Proportional Reasoning by Nurses; Modeling the Mathematics of Banking; Mathematical Models as Seen by Biologists; and How do Scientists Interpret Graphs?