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The phrase "increased three fold" is correct and usable in written English.
It is used to describe a situation where something has increased or multiplied in quantity by three times. For example, "The company's profits increased threefold last year."
Exact(7)
The enzyme production increased three fold compared to the original medium.
In the past 10 years usage has increased three fold over the previous decade but is still less than 2% of clinical trials.
In response, the council said the number of gangs fixing potholes had been increased "three fold".
In other news, Charles Schwab posted fourth-quarter profit that increased three fold from the same quarter last year, as the discount broker cut fees to lure customers.
Is this where I mention that the number of Americans living until 90 has increased three fold since 1980?
Russian training loads were increased three fold between 1968 and 1998, in speed and strength sports [27].
Similar(53)
MSR of the parental strains remained consistently low at the three coolest temperatures, increased three-fold at 22 °C, and declined at the highest temperature (Fig. 4).
Activity-wise, four-year-old Saavn is "approaching" 200 million streams per month, after the volume of streaming increased three-fold during the past twelve months.
Between 2011 and 2012, hate crime attacks on Hispanics increased three-fold.
In Germany, Italy and Portugal positive humanitarian stories about migrants increased three-fold immediately after the photographs were published.
Some military officers suggested that with fighters in Tajikistan, the number of daily missions could be increased three-fold.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com