Strategies are recorded with words, numbers, and pictures enabling students to discuss their strategies for adding and subtracting numbers with the whole class. In the first investigation, students indirectly compare lengths and find equivalent lengths using materials such as string or adding machine tape. They use non-standard units to measure length, and develop strategies for iterating and counting units. As they work with units of different sizes, students explore the relationship between the size of the unit and the number of units needed. They make and compare paths in the classroom, and, using Geo-Logo software, they estimate the length of straight paths and investigate turns as they direct the turtle through mazes and grids, and construct shapes and pictures.
Students explore a variety of materials and methods for organizing and representing data.
Students collect data about the number of teeth they have lost, make predictions about how the data might be different in younger or older classes, and work in pairs to survey other grades. They decide on the method of data collection, organize and represent the data, and then make statements about their teeth data. The final investigation involves students in all aspects of data collection and analysis as they design and carry out their own data project. Students explore a variety of data representations including some conventional representations but throughout the unit emphasis is placed on students organizing and representing data in ways that make sense to them. During this two week unit students explore concepts of time and rhythm.