Meaning of “add (sth) up” in the English Dictionary

british dictionary

"add (sth) up" in British English

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add (sth) up

phrasal verb with add uk /æd/ us /æd/ verb [ I or T ]

B1 to calculate the total of two or more numbers:

If you add those four figures up, it comes to over £1,500.
She added the bill up.
I'm not very good at adding up!

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(Definition of “add (sth) up” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)