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Order of operations is essential so that a mathematical statement can be read the same way by every person who reads it. Take for example the expression:

9 * 2 / 18 + 2 * 3

Without order of operations, this expression can have many different interpretations. These are just 3, but there are many, many more!

(9*2)/(18+2*3) = .75

((9*2)/(18+2))*3 = 2.7

9 * (2 / 18 + (2 * 3)) = 55.

So, we use order of operations so that 9 * 2 / 18 + 2 * 3 is equal to 7 every time. In other words, without order of operations, we couldn't write math down and communicate it from one person to the next. We couldn't even keep track of our own calculations from one day to the next. Without order of operations, mathematics as a science would just fall apart.

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Q: Why the order of operations necessary for simplifying numerical expressions?
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