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Earlier discussion
1 older comment kept for context.
Salami Umar
According to the dictionary round up means
verb
(transitive) To gather (cattle) together by riding around them.
(transitive) To collect or gather (something) together.
Round up the usual suspects.
(transitive) To round (a number) to the smallest integer that is not less than it, or to some other greater value, especially a whole number of hundreds, thousands, etc.
The total is $24,995 — let's round up to $25,000.
antonyms
(arithmetic) round down
translations (to collect or gather (something) together)
While round off means
To change the shape of an object to make it more circular.
(mathematics) To change a number into an approximation having fewer significant digits.
To complete or finish something.
So round off is the correct answer