Third graders determine the outcome of each of the following situations and justify their findings: even number + even number = ?, even number + odd number = ?, odd number + odd number = ?, and odd number + even number = ?.

Pupils identify the main ideas or topics of a lesson or unit using the plus, minus and interesting graphic organizer. In this main idea or topic lesson, students examine the use of the PMI graphic organizer. They describe the item they...