Richard and david are playing with blocks. as they are playing, they smile at each other and trade blocks from time to time. richard and david are involved in type of play.

Associative play

Explanation:

Associative play is when two or more kids play with their toys or blocks, speak to each other but don't work  to build something together.

They are more interested in each other than playing with their toys.  

This is the first classification that includes the children's solid social contact when playing.

answer; planning;

answer; foreign exchange transaction;