In this situation, there are things worth reinforcing (playing with language, initiative to name things, thinking about numbers), and some things that are not (

In this situation, there are things worth reinforcing (playing with language, initiative to name things, thinking about numbers), and some things that are not (false hopes of 'quadrupillion' becoming the next 'googol', or that significant contributions can be made so easily--the whole googol thing was serendipitous, not meritorious). It's a tricky situation, and I'm not sure what the best way to handle it is. But neither blind, effusive praise nor cold, harsh rejection are the best ways to go, here. If you had to pick one over the other, blind effusive praise it is, but there's definitely a middle ground here, one that selects for the things genuinely worth encouraging.