(5 + 5)=10
(10 +5)=15
Screw you common core, there is no “correct way” in math.
It is like thinking about the “climate” common core is a orthodoxy that is put in place to control HOW you are SUPPOSED to THINK.
Not “TO THINK”
I disagree. There are definitely wrong ways. If you were to say that there are often multiple correct ways in arithmetic and mathematics, I'd agree with you.