Identify the operation

Amy saw 7 birds this morning. Then she saw 2 more this afternoon. How many birds did Amy see today?

Danny has 4 blue marbles. He also has 9 red marbles. How many marbles does Danny have in all?

I have 5 books. My brother has 3 books. How many books do we have?

Kelly has 4 pencils. Jen gives her 3 more pencils. How many pencils does Kelly have now?

Laura has 2 necklaces. She has 5 more rings than necklaces. How many rings does Laura have?

Dan has 46 pokemon cards. He got 17 more for his birthday. How many cards does he have now?

Frank has 13 blocks. His brother gives him 3 more blocks. How many blocks does Frank have in all?

The tower was 57 blocks tall. The students increased the height by 15 blocks. How tall is the tower now?

There are 15 orange juice boxes and 23 apple juice boxes. What is the total amount of juice boxes?

There are 39 second graders and 47 third graders on a bus. How many students are there combined?