Emily chooses a nubmer from 1 to 10 at random, and Juan does the same. What is the probability that the sum of their numbers is less than 10?
If you made a 10 x 10 ADDITION table, you should get 100 sums. if you count the sums that are < 10, you should get 36. Therefore, the probability is: 36 / 100 =9 / 25
