Working odd summer jobs has been 'the sum of' my experience so far. [=has been all the experience I've had so far]
That picture 'sums' him 'up' perfectly. [=that picture perfectly shows what kind of person he is]
“So, you don't want to go because you think it will be boring?” “That just about 'sums it up'.”
(..) Mathletes State Championship. Let's start the competition. Here is the first question. Twice the larger of two numbers is three more than five times the smaller, and the sum of four times the larger and three times the smaller is . What are...? - North Shore? - Fourteen and five. (..)2004 Mean Girls
(..) I mean, that's just, like, the rules of feminism. Don't worry. I'll never tell Regina what you said. It'll be our little secret. We define the sum of the infinite geometric series... Even though I wasn't allowed to like Aaron, I was still allowed to look at him. And think about him. (..)2004 Mean Girls