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[–] • 0 pt

Eh no. You can't just invent brackets when there are none.

[+] [deleted] • 3 pts
[–] • 2 pts

You always do multiplication before subtraction. Order of operations

[–] • 0 pt

I just said you can't put brackets in.

[–] • 1 pt

Yes you can. Because brackets only mean that you do something first. You definitely can add them to emphasize that fact

[–] • 2 pts

Order of operations.

[–] • -1 pt

Yeh the answer is right, but you can't just put brackets in.

[–] • 1 pt (edited )

The order of operations is a rule that tells the correct sequence of steps for evaluating a math expression. We can remember the order using PEMDAS: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

You have to solve the Multiplication first, left to right. 220 * 1/2 is solved first, you would only need brackets if you wanted the 230-220 solved first.

And yes, you can just put brackets in if you are trying to clarify your equation and it doesn't change anything.

2 x 3 + 4 = (2x3) + 4