add up vs add

add up and add both are verbs.

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

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

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

add up (verb)	add (verb)
determine the sum of	make an addition (to); join or combine or unite with others; increase the quality, quantity, size or scope of
be reasonable or logical or comprehensible	make an addition by combining numbers
to measure up to in kind or quality	determine the sum of
add up in number or quantity	state or say further
	bestow a quality on
	constitute an addition