The sum of 23 25 and 29 is

The Sum of something means to add them so you get 23+25+29=77

One trick i use to add numbers is like this it to get them into groups that are easy to add. for instance, this is the same as 25+25+25+2

25+25+25=75, and 75+2=77

that works for me, but it may or may not work for everyone

Would it be 77, because sum is adding