Sam had 900 base ball cards and Tim has one- ninth as many. How many cards does Tim have?

(1/9) * (900/1) = 900/9 = ?

simplify down to make 100

To find out how many baseball cards Tim has, we need to calculate one-ninth of Sam's total number of cards.

First, let's calculate the value of one-ninth of Sam's cards:
900 / 9 = 100

Therefore, Tim has 100 baseball cards.