Fourth grade is typically the fourth year of elementary school in the United States, usually for students aged 9 to 10 years old. In this grade, children build on their reading, writing, and math skills. They often learn about topics such as multiplication, fractions, and basic grammar. In addition to core subjects, fourth graders may explore science and social studies, learning about the natural world and different cultures. This year is also important for developing critical thinking and problem-solving skills, as students engage in group projects and hands-on activities.