beth is decorating 24 cards. she decorated 1/3 of the cards on thursday and 1/2 of the cards on friday. What part of the cards does beth still need to decorate?

24 divide by 1/3 is 8 cards on thursday, 24-8=16 remaining cards

16 divide 1/2 is 8 cards on friday, 16-8=8 cards remaining

I don't know how to do from here, please help me, thank you.