Meaning of “sum” - Learner’s Dictionary

sum

noun [ C ] uk us /sʌm/
MONEY

B1 an amount of money:

a large/small sum of money
MATHS UK

a simple mathematical calculation such as adding two numbers together:

Kids these days can't do sums without a calculator.
TOTAL

the total amount that you get when you add two or more numbers together:

The sum of six and seven is thirteen.
→ See also lump sum

(Definition of “sum” from the Cambridge Learner’s Dictionary © Cambridge University Press)