Скачать или смотреть ASVAB/GED Math: Order of Operations

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PEMDAS stands for parentheses, exponents, multiply, divide, add, and subtract. That is the order in which we solve problems. If you just go left to right across an expression you will not get the right answer. Let’s look at an example.
4^2 – 6(5 -3) + 30 ÷ 5
4^2 – 6(2) + 30 ÷ 5 (parentheses first)
16 – 6(2) + 30 ÷ 5 (exponents second)
16 – 12 + 30 ÷ 5 (multiply third)
16 – 12 + 6 (divide fourth)
16 – 18 (add fifth)
-2 (subtract last)
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