It's a common instruction given in classrooms, especially to students who are going to solve a problem or present something on the blackboard.
Here are some possible translations depending on the context:
* "Go to the board" (most literal)
* "Get up to the board"
* "Go to the whiteboard" (if the classroom uses a whiteboard)
* "Write on the board" (if the context is clear that the student is going to write something)
Let me know if you have any other French phrases you want to understand!