Mark loves to go for a walk every morning. He begins his day with a brisk walk around the neighborhood. Sometimes, Mark begins early and finishes more rounds than usual, but if he’s late, he doesn’t walk as much. Read the paragraph to find out how many rounds Mark completed on each day of the week. Then use the information to fill in the graph in this free graph worksheet. ‘Mark’s Exercise’ is perfect for practicing graphs and mental math with fourth graders.