Combined operations are math expressions that mix several operations — addition, subtraction, multiplication, division, exponents and parentheses — and they are solved following a fixed order, not simply from left to right. They are taught around 4th to 6th grade, between ages 9 and 12, and they are the foundation for solving equations later on.
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What are combined operations?
A combined operation is any math exercise that puts two or more operations together in a single expression, like 3 + 2 × 4. If a child solves this left to right, they get 20, but the correct answer is 11, because multiplication is solved before addition.
That is exactly the problem the order of operations solves: without a fixed order, the same expression could have several different results. With the correct order, anyone anywhere in the world always arrives at the same number.
