The phrase "are multiplying fast" is correct and usable in written English.
It can be used to describe a situation where something is increasing or growing rapidly.
Example: "The number of online users are multiplying fast as more people turn to digital platforms for their needs."
Alternatives: "are increasing rapidly" or "are growing quickly."
ALTHOUGH digital images of Hollywood stars and executives are multiplying faster than they can be viewed, the images that exert the strongest pull on many of them, it seems, are the painted portraits they hang over their sofas.
It's hard to tell which are multiplying faster, Starbucks or the latest version of Rande Gerber's Whiskey bars (the latest is the Whiskey in the W Times Square).
Since plastids with plastome III are multiplying faster than those with plastome II, they have the potential to outcompete plastome II plastids in this population.
Even then, because of their clout in the market and their economies of scale, it is likely to be Apple or Samsung which pioneer them.The choice of brands available to consumers is multiplying fast, however.
And although they may not be multiplying fast, in some centers, like Silicon Valley, Boston and Southern California, whatever employment already exists has enough inertia to allow them to remain the largest tech centers in the country.
I'm baffled by the increasing number of nail salons in this country, which seem to be multiplying faster than Starbucks counters.
Some lawyers speculate that the I.R.S. eliminated its time limit last year simply because inquiries involving the tax break were multiplying faster than it could handle them.
And the bad news: the heroin addict population is multiplying faster than statistics can be recorded.
But how do you uphold a certain basic standard of respect and gentlemanly conduct when the Jericho-like instigators seem to be multiplying faster than "u r a douche" comments on Digg?
