Is CaF2 (calcium fluoride) acidic or basic? Is Ca(OH)2 a strong or weak base?

So I learned to look at where each ion came from. Ex: NaCl is a neutral salt because NaOH is a strong base and HCl is a strong acid. If you have NaF, this is slightly basic since NaOH is a strong base and F comes from HF which is a weak acid...