40÷[20−4⋅(7−4)]

Question

40÷[20−4⋅(7−4)]

mathstudent55 · Answer

You need to follow the correct order of operations.
Start with the innermost parentheses

kg1975 · Answer

?

mathstudent55 · Answer

The brackets are outer parentheses.
The regular parentheses are the innermost parentheses.
Start by doing 7 - 4.

kg1975 · Answer

3

mathstudent55 · Answer

40÷[20−4⋅(7−4)] =

= 40÷[20−4⋅3]

Good.
Now you need to work inside the brackets.
You must do multiplication before you do subtraction.
What is 4 * 3?

kg1975 · Answer

heh?

kg1975 · Answer

can someone just help with the answer my test is gonna close if i dont put it in

mathstudent55 · Answer

40÷[20−4⋅(7−4)] = 

= 40÷[20−4⋅3] 

What is 4 * 3 ?

kg1975 · Answer

12

mathstudent55 · Answer

Good.

40÷[20−4⋅(7−4)] = 

= 40÷[20−4⋅3] 

= 40÷[20−12] 

Now you do the subtraction inside the brackets.

What is 20 - 12?

mathstudent55 · Answer

20 - 12 = 8

Finally you do the division.

40÷[20−4⋅(7−4)] = 

= 40÷[20−4⋅3] 

= 40÷[20−12] 

= 40÷8

= 5

mathstudent55 · Answer

Order of operations:

PEMDAS

P = parentheses
E = exponents
MD = multiplications and divisions from left to right
AS = additions and subtractions from left to right.