Phrasal Verbs with ADD

add in
to include something as part of something else
Remember to add in the cost of food and drinks.

add on
to include an extra thing or amount in something
A service charge was added on to the bill.

add to
to make something larger, better, or greater
Their research has added to our knowledge of the subject.

add up
to calculate the total of two or more numbers or amounts
She quickly added up the figures in her head.

add up
to make sense; to seem to be logical or true
He must be lying. His story just doesn’t add up.