+0

# math

+3
463
3
How do I get 9+4*(8*8-30)
Apr 4, 2014

#3
+8259
+5

CPhill didn't give you the answer, then I will.

$${\mathtt{9}}{\mathtt{\,\small\textbf+\,}}{\mathtt{4}}{\mathtt{\,\times\,}}\left({\mathtt{8}}{\mathtt{\,\times\,}}{\mathtt{8}}{\mathtt{\,-\,}}{\mathtt{30}}\right) = {\mathtt{145}}$$

Aug 1, 2014

#1
+111395
+5
9+4*(8*8-30)
Apr 5, 2014
#2
+1667
+3
There is something called the Order of Operations. This is a rule that states that there is a certain order in which you have to do a problem.

It goes like this:

Parentheses
Exponents
Multiplication & Division

The problem is 9+4*(8*8-30).
First, we need to do what's in the parentheses. There is multiplication AND subtraction, but we do the multiplication first. That gets us 9+4*(64-30)
Finish what's in the parentheses. 9+4*34
There is only addition and multiplication, but multiplication is done first. That gets 9+136.
Do the addition which gets you 145!

Tip: I remember the Order of Operations with a mnemonic.

Parentheses
Exponents
Multiplication
Division
Subtraction

turns into

Excuse
My
Dear
Aunt
Sally
Apr 5, 2014
#3
+8259
+5
$${\mathtt{9}}{\mathtt{\,\small\textbf+\,}}{\mathtt{4}}{\mathtt{\,\times\,}}\left({\mathtt{8}}{\mathtt{\,\times\,}}{\mathtt{8}}{\mathtt{\,-\,}}{\mathtt{30}}\right) = {\mathtt{145}}$$