I hadn't thought of the "common sentence" approach. Woops.
I was thinking semi-intelligent parsing and it recognized "two" and "plus" and created a formula 2+2 then solved it with 4 ("four").
So I had assumed it would have done the same with "ten", "minus", and "two" to create 10-2, solve it, and respond with 8 ("eight").
If you use Google Search and search for "ten minus two" it's intelligent enough to parse the search and give you a calculator with 10-2=8 already inputted. I had assumed a similar parsing approach may have been used for their conversation bot in regards to general mathematical knowledge.
I was thinking semi-intelligent parsing and it recognized "two" and "plus" and created a formula 2+2 then solved it with 4 ("four").
So I had assumed it would have done the same with "ten", "minus", and "two" to create 10-2, solve it, and respond with 8 ("eight").
If you use Google Search and search for "ten minus two" it's intelligent enough to parse the search and give you a calculator with 10-2=8 already inputted. I had assumed a similar parsing approach may have been used for their conversation bot in regards to general mathematical knowledge.
But your explanation makes a ton of sense. :)