Let's look at some patterns:

triangle , square , triangle , square , square , triangle , square , square , square , ___

Do you see the pattern?

What will the next shape be?  triangle


TRY IT:

What's the next shape?

circle , triangle , square , circle , circle , triangle , square , circle , circle , circle , triangle , square , circle , ___


What about this one?

0 , 3 , 6 , 9 , 12 , 15 , ___

What will the next number be?  18

We added 3 each time.


TRY IT:

What's the next number?

5 , 3 , 1 , -1 , -3 , -5 , -7 , ___


Here's another:

1 , 4 , 9 , 16 , 25 , 36 , 49 , ___

What's the next number?  64

These are all squares.