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To save the planet. If you're talking about math, it's because when you reduce, you make it simpler and easier to work with.
simplest form is when you take a fraction and you reduce it so it cant be reduced anymore
You need common denominators. Then add or subtract the numerators. If the answer is an improper fraction it is common practice to reduce it to a mixed number.
No, they have absolutely no need for mathematic knowledge. Could they use math to reduce the amount of work they needed to do or design the best way to do it? Sure, but they don't. Yes. Indeed they do! For ten years I was a math teacher for a community college. I taught convicts at a med/max prison in Southern Illinois how to get a job as a custodian. I taught my convict students basic math, business math, geometry, algebra, and the metric system.
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