add up

And all of that stuff adds up, especially when you don't have a lot of money to begin with.

So, the first and second numbers add up to the third, the third and the fourth add up to the fifth, and so on.

So the first and second numbers add up to the third, the third and the fourth add up to the fifth, and so on.

When you're young, you don't understand the many steps that add up over time.

But when you add up all the possible unexpected things that could happen, all these infinite, unexpected things that could happen out there, it actually becomes quite likely that something unexpected happens.