Plz not good at math pattern game help!?

Question

ok i have an open response for school and i can get the other questions except this one it goes like this and i have to find the next three terms and how the guy who made this pattern made it! like what do they add each term

1,1,2,3,5,8,13,21_,_,_

Answer 1

Fibonacci sequence

1,1,2,3,5,8,13,21,34,55,89

Answer 2

Fibonacci sequence. Add the preceeding two numbers to get the next. Google search for the rest. Good luck.