@howie_hua I had to look up what method I was using. Seem be called "short division". Anyway, as kid I used to multiply large numbers in head, do square root in head, etc.
@Tylerbrooks56 Let me, there is a guy who walk into the background 2x, and the guy who make a video have a red hat on before the baby's head block him. Right after the baby no longer block, he have lost his hat.