sum up vs summate

sum up and summate both are verbs.

Word	Noun	Adjective	Verb	Adverb
sum up	No	No	Yes	No
summate	No	No	Yes	No

As verbs, sum up and summate are synonyms defined as:

Other synonyms of sum up include add, add together, add up, sum, tally, tot, tot up, total, tote up.

sum up (verb)	summate (verb)
give a summary (of)	determine the sum of
determine the sum of	form or constitute a cumulative effect
be a summary of