Be a detective and figure out the missing number! This activity addresses 1.OA.8. It includes directions, one student write the room activity with 12 problems, a student recording sheet, an answer key, and two credit/thank you pages.
This is a piece of my larger unit which contains every operation and algebraic common core standard. It's priced for only $5! You can find the entire product here. Operation and Algebraic Thinking Write the Room Activities for First Grade!