tot up vs add up

tot up and add up both are verbs.

Word	Noun	Adjective	Verb	Adverb
tot up	No	No	Yes	No
add up	No	No	Yes	No

As verbs, tot up and add up are synonyms defined as:

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

tot up (verb)	add up (verb)
determine the sum of	determine the sum of
	be reasonable or logical or comprehensible
	to measure up to in kind or quality
	add up in number or quantity