1 million, 2 million, 3 million, 20 million
Oh, I'm so good at math

from Jay Z – Somewhereinamerica Lyrics on Rap Genius

Meaning

JAY-Z IN PRESCHOOL

JAY: 1, 2, 3… 20 mil. I’m so good at math!
TEACHER: Shawn, you skipped a few numbers…
JAY: STFU, I'mma be Jay-Z!

Jay-Z is referring to the $20 Million deal he did with Samsung — and how much of a good deal it was. This echoes an earlier line on “U Don’t Know

Jay is pretty good at this type of stuff, look how fast he can double numbers

Coincidentally the Magna Carta Holy Grail app recieved 20m requests in the first hour and the app crashed

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