Just in time for Spring! Julie Rosenberg creates another printable math worksheet featuring Superdog Plato and His Sidekick Ollie. The superheroes embark on many adventures in math and phonics. In this mission, the dogs must fill in missing numbers to help butterflies reach flowers. The lesson involves counting by 1's, 2's, 3's, 5's or 10's. It reinforces number concepts and basic counting skills.