Firstly, Homework helps students understanding the content of the lesson. Reviewing knowledge in the classes can help students not forget what they learnt. When students learn new things in the school, they are lasted as short-term memory. By practice of information, which is homework we talk here, short-term memory is converted into long-term memory, so that students won’t forget after days(Akman,2014). In addition, homework makes students to practice more than in classroom. The assignment not only increases the knowledge of the students, but it also improves their abilities and skills to solve problem. Homework may be designed to reinforce what students have already learned and prepare them for next lessons.