I learned the best thing today at an interview, which I know sounds a bit weird. Usually at interviews it’s all about what I’ve done and where I see myself in 5 years and whatnot. This interview was far different, and better, and awesome. Today at my interview, I learned something really great about… subtraction.
Let’s take a problem like “7 - 2“. We can read the subtraction sign as “as compared to“. When we find 7 and we find 2 on a number line, comparably they are 5 apart. And indeed, 7 - 2 = 5.
But does it work for subtracting negatives? let’s check…
“7 - -2″. Seven as compared to negative 2. 7 and -2 are 9 apart, and in fact 7 - -2 = 7 + 2 = 9!
This is a SUPER model that, as my boyfriend just said, opens a whole new world. Who knew at 33 I’d still be learning subtraction!