Identify the problem that represents the join, result unknown structure
A) Maryann had 3 library books before she checked out 2 more. How many did she have all together?
B) Maryann had 5 library books before she returned 2 of them. How many does she have now?
C) Maryann had 4 nonfiction books and 2 fiction. How many more nonfiction books does she have?
D) Maryann had 9 library books and Jim had 4. How many more did Maryann have than Jim?
3) Which problem represents the separate, start unknown structure?
A) Maryann had 3 library books before she checked out 2 more. How many did she have all together?
B) Maryann had 5 library books before she returned 2 of them. How many does she have now?
C) Maryann had some nonfiction books and 2 fiction. She now has 8 books. How many did she begin with?
D) Maryann had 9 library books and Jim had 4. How many more did Maryann have than Jim?
Answer: A
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