"Add up the prices and find out how much it will cost.; When they added up the vaccine doses from all known and anticipate sources, they didn't have enough."
2.VerbTo accumulate; to amount to.
"If you can save even a couple of dollars per day, it will add up to a lot over a year."
3.VerbTo make sense; to be reasonable or consistent.
"His story just doesn't add up. Why would he have been at the restaurant the day before the event?"