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# WHEN DO YOU NEED TO USE PEMDAS, DO YOU USE IT EVEN THROUGH YOU DON'T HAVE PARENTHESES OR EXPONENTS

I need help solving this problem

1+1+1+1+1+1+1+1+1+1-1+1+1+1+1+1*0

there are 10 ones infront  of the minus sign and 6 ones after the minus sign

also need to know if I need to use PEMDAS for every math problem even if it doesn't have parentheses

### 3 Answers by Expert Tutors

Megan K. | Science/Math Whiz Ready To Help With Your Class Work or Test Prep!Science/Math Whiz Ready To Help With You...
4.8 4.8 (14 lesson ratings) (14)
0

Incorrect Brian.... the multiplication step clears first before adding or subtracting any numbers.

Regina G. | Biotech Grad with Homeschool Experience, Math and Science FocusBiotech Grad with Homeschool Experience,...
5.0 5.0 (279 lesson ratings) (279)
-1

No, you would only multiply the last 1 by zero, as you do multiplication first, by PEMDAS. Then, you would add  or subtract the remainder of the ones.

To answer the question, you would use PEMDAS to answer any math question, especially if there are no parentheses.

Here is the original:
1+1+1+1+1+1+1+1+1+1-1+1+1+1+1+1*0

Here, I add my own parentheses, according to PEMDAS:

(1+1+1+1+1+1+1+1+1+1)-1+ (1+ 1+1+1) +1*0

The last phrase = 0, and we evaluate it first, because it's multiplication, so:

(1+1+1+1+1+1+1+1+1+1)-1+ (1+ 1+1+1) + 0

The first phrase =  10, because we're just adding 10 ones together, so:

(10) - 1 + (1+ 1+1+1)

Now, adding the last phrase, since I put it in parentheses:

(10) - 1 + (4)

Now, combine the first two terms:

9 + 4

13

PEMDAS
10 - 1 + 4 =
10 - 5 =
5
You work PEMDAS from left to right, so (10 - 1) + 4 = 9 + 4 = 13.

I added the parentheses for clarity, but they don't change anything.
1+1+1+1+1+1+1+1+1+1-1+1+1+1+1+1*0
you multiply first. 10-5+1*0
10-5+0
5+0=5
order of operation is multiply first then add or substract from left to right
Brian W. | Highly qualified writing, english, reading, and vocabulary tutorHighly qualified writing, english, readi...
5.0 5.0 (12 lesson ratings) (12)
-3

Unless there is a typo here, you have a trick question.  Note you have plus and minus signs until the zero.  There appears to be a multiplication sign in front of the zero.  If that's correct, the answer is zero as you just multiplied the entire problem by zero.

1+1+1+1+1+1+1+1+1+1-1+1+1+1+1+1*0

You always do all higher order functions such as EXPONENTS and ROOTS and MULTIPLICATION and DIVISION before any addition or subtraction (which are evaluated left-to right).

Solve the (1x0) = 0 first and remove it from the problem, then, as there are no other higher order functions, move on to addition and/or subtraction.

Feel free to group all the additions together and all the subtractions together.

(1+1+1+1+1+1+1+1+1+1+1+1+1+1+1) (-1) then reduce and simplify by grouping the last +1 with the -1: (+1-1) = 0.

(1+1+1+1+1+1+1+1+1+1+1+1+1+1 (+1-1) Adding 1 then taking it away again... remove from problem. Now add.

1+1+1+1+1+1+1+1+1+1+1+1+1+1 = 14

(continued)

OOPS! Typos/mistakes in the above - Answer is 13 NOT 14. Picked up an extra +1 somewhere. lol Why I always prove and double check...

Let's try this again without the mistakes...

1+1+1+1+1+1+1+1+1+1-1+1+1+1+1+1*0

You always do all higher order functions such as EXPONENTS and ROOTS and MULTIPLICATION and DIVISION before any addition or subtraction (which are evaluated left-to right).

Solve the (1x0) = 0 first and remove it from the problem.

1+1+1+1+1+1+1+1+1+1-1+1+1+1+1+(1*0)

Then, as there are no other higher order functions, move on to addition and/or subtraction.

1+1+1+1+1+1+1+1+1+1-1+1+1+1+1

Feel free to group all the additions and all the subtractions. Let's put the subtraction at the end for clarity.

(1+1+1+1+1+1+1+1+1+1+1+1+1+1)-1 = solving left to right results in

14 - 1 = 13