Answer: Juan buys 2.47 pounds of cheese in all.
The question is asking you how many pounds of cheese he bought. He buys 1.09 pounds of cheddar cheese and 1.38 pounds of mozzarella cheese. All we need to do is add 1.09 and 1.38.
Step one: Set up the equation (make sure the decimals are lined up)
1.09
+1.38
Step two: Add
1.09 *make sure to bring down the decimal
+ 1.38
------
2.47
So all together Juan bought 2.47 pounds of cheese.