Number
Order of operations
When several operations follow each other, we agree on a fixed order: brackets, powers, times and divide, plus and minus. That way everyone gets the same answer.
What you need first
Why
You buy a drink for 2 euros and three portions of chips at 4 euros each. Is that 2+
If you just work from left to right, you get 2+
A calculation has to mean the same to everyone, on paper, on your calculator and in a spreadsheet. That is why there is an agreement about which operation comes first.
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