Daily reflection

Today in maths I learnt how to find out what number comes next in a pattern without going through and writing every number down. Because of this learning I can now understand how to get the answer quickly because I wont have to write it all down.
Something I don't understand is how to find out the next 100 or 1,000 numbers in a pattern.
The next step in my learning is to find out how to list all the numbers upo to 1,000 without writing every number down.