Question

Tom bought 9 new baseball trading cards to add to his collection. The next day his dog ate half of his collection. There are now only 28 cards left. How many cards did Tom start with ?

Answer 1

Tom started with 47 cards

28+28=56

9 are new so 56 - 9 = 47 which is your answer

Answer 2

Tom started with 47 cards.

He had 28 left. If his dog ate half then multiply 28 by 2

You get 56

Out of those 56 cards, 9 of them are new

So subtract 9 from 56

You get 47