The phrase "added less than a" is correct and usable in written English.
It can be used when discussing quantities or amounts that are below a certain threshold.
Example: "The final score added less than a hundred points to the team's total."
Alternatives: "contributed under a" or "increased by fewer than a".
The Australian Rules football graduate Ben Graham needs to add less than a yard to his net average to set the team season record for punting.
Even if they all remained permanently unemployed -- which is obviously unrealistic -- this change would add less than a percentage point to the normal unemployment rate.
With $250 separating the Mini S from the Mini X, a gray-wheeled version of the product that adds less than a couple of pounds but doubles the total range from 7 to 14 miles and increases max speed by a couple of miles, there might be enough there to offer a full endorsement of making an upgrade if you want to try out the electric shortboard life.
If your animals have had the 'pleasure' of tasting this stuff before, you can add less than a drop of all-natural dish soap to act as an emulsifier.
Since 2001 the increase in emerging Asia's trade surplus has added less than one percentage point a year on average to the region's average growth rate of almost 7%.
Sirf Technology, which makes chips that incorporate the satellite receiver and compass into cellphones, said they added less than $10 to the cost of a handset.
A key finding was that age at adoption added less than other predictors to adoptees' externalizing and internalizing behaviors.
It added less than five minutes.
Shares of the department store chain added less than 1%, while Macy's climbed 3.6%.
Norton added less than 5 percent to the time it takes to complete file operations.
