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In mathematics, there is an order of priority for arithmetical operations. It is variously known as BODMAS, PODMAS. When working with an expression, an operation indicated by D (Division) must be performed before A (Addition). Sometimes you need to change the order and brackets are used to do that.

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Q: Why do you use brackets?
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When to use brackets instead of parentheses?

Use brackets when you are creating a parenthetical within a parenthetical.


What are the grammatical rules for brackets?

Use the same rules inside brackets as you would outside of brackets. There is no difference between the two.


How do you use brackets?

Use brackets to group similar ideas in math and to create a parenthetical within a parenthetical in writing.


How do you use square brackets in a sentence?

Square brackets are used inside regular parentheses, in a sentence.


When do you use parentheses and brackets?

The different types of brackets are:round brackets, open brackets or parentheses: ( )square brackets, closed brackets or box brackets: [ ]curly brackets, squiggly brackets, swirly brackets, braces, or chicken lips: { }angle brackets, diamond brackets, cone brackets or chevrons: < > or &#10216; &#10217;Parentheses (singular, parenthesis)---sometimes called round brackets, curved brackets, oval brackets, or just brackets, or, colloquially, parens --- contain material that could be omitted without destroying or altering the meaning of a sentence. Example: Sometimes I like to use parenthesis (they make everything more fun).Square brackets are mainly used to enclose explanatory or missing material usually added by someone other than the original author, usually in quoted text. Example: I appreciate it [the honor], but I must refuse.Curly brackets (also called braces, or "squiggly brackets") are sometimes used in prose to indicate a series of equal choices. Example: Select your animal {goat, sheep, cow, horse} and follow me.Angle brackets are often used to enclose highlighted material. Some dictionaries use angle brackets to enclose short excerpts illustrating the usage of words.An example can be:I used the brackets to mark off important information in my research paper.