The phrase "a tiny fraction of it" is correct and usable in written English.
You can use it when referring to a very small part or amount of something larger.
Example: "The research findings were impressive, but they only represented a tiny fraction of it in the overall context of the study."
Alternatives: "a small portion of it" or "a minuscule part of it".
My first reading, as a teenager, brought me painfully through only a tiny fraction of it.
I was also told that nowadays so much is known that no one could conceivably learn more than a tiny fraction of it, even in a long lifetime.
The first hybrid cars went on the market in 2000, and they make up a tiny fraction of it, with just 700 sold last year in New York State.
But I just don't see how more than a tiny fraction of it could possible adhere to our electrician or teacher or secretary who's decided, basically, that the financial services professionals and government regulators know what they're doing.
And money could be "programmed" to come with conditions: for instance, it might be released only if a third person agrees.Some want ownership of devices a car, say to be represented by a Bitcoin, or a tiny fraction of it.
Yet, only a tiny fraction of it is harnessed commercially for space heating or for electricity by conversion at some expense (Clauser 2006).
Just a tiny fraction of its stored profits could win it the best catalogue in streaming.
The number of WSJ.com pages bookmarked on del.icio.us or indexed by Google is a tiny fraction of what it would be if it was a fully open site.
But now the region is considered one of the safest parts of the Mexican border, and the number of apprehensions of people crossing illegally is a tiny fraction of what it was a decade ago.
The fact that its technological reach is vast, its resources almost limitless, and its operations are shrouded in secrecy, make it difficult for a handful of elected representatives to effectively monitor even a tiny fraction of what it does.
