Everyone knows how to count:

1   2   3   4   5   6   7   8   9   10

But ... sometimes if you want to count to larger numbers you can        
Skip Count.

You can use even numbers:

                           2               4              6

Or count by odd numbers:

1      3     5      7     9    11  

You can count to large numbers by skip counting by 25s.

                             25              50            75            100

      

You can skip count by 50s

50  100   150   200   250   300

Or by 100s

100    200    300  400    500    600