explain how you can find the sum 25 + 59 without paper, pencil or calculator. Find the sum? How do I do this

Answer 1

You could add 20 and 60 = 80.

And add 4 more.

Or -- you could add 25 and 60 and subtract 1.

Answer 2

Do 20+50 which is 70 then 5+9 which is 11 then add 70+11.