How do both intersect?

[Jennifer Torres 2L]

How would formal charge help you find the oxidation numbers?

[Chem_Mod]

Formal charge is the charge assigned to an atom in a molecule.

Oxidation number/oxidation state shows the total number of electrons which have been removed from an element (a positive oxidation state) or added to an element (a negative oxidation state) to get to its present state.

[lindsey_ammann_4E]

Finding the oxidation number of each element in a molecule gives you the formal charge of each element and subsequently that of the whole molecule.

[Kobe_Wright]

They are basically the same oxidation is the number of electrons needed to fill, or number needed to take away to fill an octet, and formal charge shows the overall charge of an atom and what it needs to balance that charge which is usually done by the formation of an octet.