What was the norths plan on how to count slaves?

The Three- Fifths compromise.

It counted the slaves as part of the population in order to determine representation and taxation for the federal government. The idea would count three out of five slaves toward the population.

Hope this helps.

The way this small state - large state compromise guards against tyranny is that small states and large states have one note: i am sorry but i was not able to give you the full answer. but i got this answer from