Copy these Diamond Problems and use the pattern you discovered earlier, shown at right, to complete each of them. Some of these may be challenging!

1. 

   Hint (a):

   Look at the pattern. You have $xy$ and $x$. How can you use those to fill in the rest of the diamond?

   Answer (a):

   

2. 

   Hint (b):

   To find the top answer, multiply the two given numbers. To find the bottom answer add the two given numbers.

   Answer (b):

   

3. 

   Hint (c):

   Refer to part (a).

   Answer (c):

   

4. 

   Hint (d)

   Refer to part (a).

   Answer (d):