I use a pencil, ruler, and chalk to draw on the blackboard in my classroom.The teacher left her ruler and chalk on the teacher's desk next to the blackboard.I prefer using a pencil on the blackboard instead of chalk because it is easier to erase.The blackboard was covered in chalk dust after the teacher wrote on it during class.I need a new pendesk for my office to help keep my desk more organized.The teacher marked the correct answers on the blackboard using a white chalk.