How you could multiple 6×99 in your head?

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

What kinds of numbers make up the set of numbers called the real numbers? give examples when you explain a number type. there are a limited set of types of numbers, but an unlimited number of examples of these numbers.

If eh = hg and hg=16, find the diameter of k