Superdog Plato and his Sidekick Ollie's Mission Addition by Julie Rosenberg. This worksheet can be used to illustrate the commutative property of addition (when two numbers are added, the sum is the same regardless of the position of the addends). It also reinforces counting and basic addition. Superdog Plato and his sidekick Ollie embark on many adventures involving math, phonics and reading comprehension. On this mission, the two dogs must figure out who has more bones and toys by counting and adding the objects. In the end they realize they both have the same amount. This activity can be done as a whole group or as independent work.