Question #f4504

Nov 18, 2017

$2 + 2 - 2 + 2 + 2 - 2 = 4$

Explanation:

2  + 2    -2   + 2 + 2 - 2
╲ ╱
4       -2    + 2  + 2 - 2
╲ ╱
2         + 2   + 2 - 2
╲    ╱
4            + 2 - 2
╲    ╱
6           - 2
╲      ╱

Another solving method you might try is to collect all the (plus 2s) and all the (minus 2s) separately, and then combine them.

(2 + 2 + 2 + 2) and (-2 -2)
8             and    - 4

Combine + 8 and - 4
8 - 4
............................

The White Queen asked Alice in Wonderland a similar question.

"Can you do addition?" the White Queen asked. "What's one and one and one and one and one and one and one and one and one and one?"

"I don't know," said Alice. "I lost count."

"She can't do addition," the White Queen interrupted.

Nov 18, 2017

$\text{Answer} = 4$

Explanation:

In order to answer this, take the equation step-by-step (deal with the first two numbers then the next two and so on). Since we typically use PEMDAS, with A and S interchangeable (same as M and D) depending on which operation comes first, then the answer to the question is:

$2 + 2 - 2 + 2 + 2 - 2$
$= 4 - 2 + 2 + 2 - 2$
$= 2 + 2 + 2 - 2$
$= 4 + 2 - 2$
$= 6 - 2$
$= 4$