The phrase "adding that the biggest" is correct and usable in written English.
It can be used when introducing additional information or clarification about something significant or noteworthy.
Example: "The report highlighted several issues, adding that the biggest concern was the lack of funding."
Alternatives: "noting that the largest" or "mentioning that the most significant".
"I'm looking at it because we may take some action," he said, adding that "the biggest question we have is the constitutionality" of allowing slot machines.
"When I turned 40, I decided that if I was ever going to do this, it was now," he said, adding that the biggest problem in being an older student was that "the memory kind of fades".
Last year, Dior had its largest annual sales gain in couture in its 60-year history, said Catherine Rivière, the couture director, adding that the biggest spenders come from Russia and the Persian Gulf states.
"They are having to start all over again, and it's not easy," he said, adding that the biggest risk was that the Brexit process would drag on for too long and add "incertitude to incertitude".
"In the real world, antidepressants are taken for many, many years," said Van Tulleken, adding that the "biggest analysis" of the effectiveness of these medications was a study published in The Lancet that followed patients for only eight weeks.
"We have stemmed the tide, and it has been very good for us," Mr. Reuter said, adding that the biggest increases in bus ridership have come on weekends and at times other than rush hours.
But the effort to detect a Tokai earthquake will continue, he said, adding that the big earthquake might be approaching.
But during heated exchanges at Holyrood, Labour accused the SNP Government of creating "austerity on stilts" by passing Westminster cuts onto councils rather than taking action – adding that the "big losers" of the Budget would be schools and local public services.
"He has said that we will stay until the mission is complete," McClellan responded, adding that "the bigger mission" there was to achieve a "free, peaceful, and democratic Iraq".
It was his first public appearance since he caused controversy by suggesting some people struggle to get on in life because of their low IQs, adding that the bigger cornflakes tended to end up at the top of the packet.
New York Magazine labeled Chuck and Blair's relationship as the "Longest-Delayed Breakup" of the season, adding that "the big news was that Blair and Prince Louis are somehow still together and engaged, with the wedding scheduled for November sweeps.
