It's much easier to prevent a problem than to fix it when it begins. Beginning on the first day of class, make it clear that listening is not optional. Students who disrupt class should face consequences, such as being sent out of the class to study hall, while students who listen attentively should be rewarded with extra independent time or glowing notes to their parents. Talk about classroom rules and consequences on the first day. Students are more likely to listen when they know their teacher has high expectations.
Getting students to follow a long string of directions or keep track of a complex problem or story can be challenging, particularly when they are already distracted. Rather than giving students complex directions, get back to basics. Give them step-by-step instructions. For example, tell them to take out their pencils. Then tell them to take out their books only after every student in the class has followed the first direction.
Students are more likely to listen carefully when class is interesting and engaging. Try incorporating pop culture references or sharing funny stories. Particularly when a lesson is technical or challenging, explain how it is relevant to a student's life. History teachers, for example, can make the personalities of historical figures come alive with funny anecdotes. When possible, try to get students physically involved. Encourage game-playing, acting out scenes or races to complete projects. Students who are moving around are less likely to get bored and fidgety.
A rowdy group of middle school students is enough to try even a veteran teacher's nerves. But students who learn that they can get a rise out of a teacher by being obnoxious tend to continue pushing boundaries. Speak in a calm voice and avoid yelling or showing frustration. Sometimes lowering your voice can gain students' attention, particularly if they have to stop talking to get useful information.