Sometimes sessions are independent, but other times adjacent sessions will be grouped together. The first Session is called Reasoning About Multiples . There are two Activities that happen to be whole class activities. In the first, the teacher has the class count by 100's. The teacher asks for volunteers for each number, and stops at 1200 to say We're up to 1200 counting by 100.
Students are to offer explanations that the teacher records on the board.
Again, the explanations are recorded on the board. The class then counts by 100's in seat order so that the correct answer can be determined. In the second activity in this Session, the class starts at a different number, such as counting forward or backward by 25 from 1000. The worksheet to accompany this session as homework has three situations counting by 25's, 20's, and 10's. In the third case, the first number counted is 110.