grammatical number - Need we use “sums” in sentences whenever they describe the sum of plural objects?

Need we use sums in the case that the sentence describes the sum of plural objects?

For example, “100 centimeters sums to one meter” versus “100 centimeters sum to one meter”.

They both seem make some senses. For one thing, it is the sum of 100 objects, so it is suitable to use plural. For the other, in spite of how many things summed, the sum itself is a singular, so we’d better to use it in the singular way.

Which side is correct?