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Do some arithmetic and make sense (3,2)

Ross

I believe the answer is:

add up

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'make sense' is the definition.
(synonyms)

I don't understand the remainder of the clue.

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(Other definitions for add up that I've seen before include "Aggregate, get total" , "Reckon" , "Ring true" , "Seem consistent or reasonable - arithmetically?" , "Point to a reasonable conclusion" .)

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