The conversations are rather enlightening. >What is the color of water? Water. I'm quite puzzled how it knows "two plus two" is four but "ten minus two" is "seventy-two". I wonder how it parsed one correctly but failed drastically to parse the other.
It did not see enough examples to learn a general addition algorithm. "Two plus two equals four" is a common sentence, "Ten minus two equals eight" isn't. In fact, it's likely that no one learns addition by listening to examples, you're taught to execute a specific algorithm and it takes many people years to master it. In fact, ask a toddler what "ten minus two" is and you might get a similar nonsensical answer.
Just working through maths problems with my 6 year old son on a daily basis now, and it's oh-so-hard not to face palm in front of him. So many things that seems incredibly obvious are hard learned lessons. One of the fascinating things of helping him practice is that it's helping me recognise the sheer number of simple little shortcuts I apply to even something as basic as addition (and incredibly hard to hold back and give him the chance to practice the basics before I show him the "cheats").