Teachers teach math, english, reading, science, and history, Teachers often work with students from varied ethnic, racial, and religious backgrounds. Teachers design classroom presentations to meet student needs and abilities. They also work with students individually. Teachers plan lessons, grade tests, prepare report cards, and meet with parents. Seeing students develop new skills and gain an appreciation of knowledge and learning can be very rewarding.  Median annual earnings of kindergarten, elementary, middle, and secondary school teachers ranged from $37,610 to $42,080 in 2000. Median earnings for preschool teachers were $17,810. Teachers can boost their salary in a number of ways. Some teachers earn extra income during the summer teaching summer school or performing other jobs in the school system.