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The phrase "an additional sum" is correct and usable in written English.
It can be used when referring to an extra amount of money or resources that is being added to an existing total.
Example: "The project will require an additional sum to cover unforeseen expenses."
Alternatives: "an extra amount" or "a supplementary total."
Exact(36)
Furnishings can be included for an additional sum.
Frito-Lay spends an additional sum estimated at $75 million annually on other marketing communications programs.
If we produce their show, they will be paid an additional sum based on the standard Dramatists Guild contract.
(Payments would return to 100percentt in 2012, including an additional sum to make up for the underpayments).
Nets officials, however, say Barclays will pay an additional sum for other promotional rights connected to the project.
If results were above average, teachers could earn an additional sum of up to $4,000.
Similar(24)
But Bristol Mayor Marvin Rees said she was not paid "any additional sum" and left on the terms of her contract.
In respect of the health service, in the comprehensive spending review of the year 2000, we put a huge additional sum of money into the National Health Service.
The other tenants in the building who had already purchased their apartments had surencheres placed on them, and had to pay a substantial additional sum.
The perpetuation of his tax cuts, the continuation of his new prescription drug benefit, the management of his wars and the interest payments on debt that he accumulated account for a crucial share of the additional sum Obama has amassed.
Eventually, this additional sum resulted in a doubling of emission estimates.
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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