He brings the 47 cranes that he has folded so far to class and asks for help to fold many more. The class decides to have each of the 26 students fold one crane each week for the rest of the school year. The teacher asks groups of students to find a way to determine how many cranes will be in the collection after some given number of weeks. They figure out whether they can reach 500 cranes by the end of the year. Represent situations and number patterns with concrete materials, tables, graphs, verbal rules, and number sentences, and translate from one to another.
Students compare two allowance plans.
Plan B starts with 1 cent and doubles the allowance each week. They might want to try to use physical objects such as centimeter cubes to demonstrate the behavior of the two plans visually. Each student is given an even number of square tiles and asked to use them all to make a rectangle with two columns. Students are asked to notice that the heights of the rectangles are different for different starting numbers of tiles. They collect the data into a table, giving each student's name, the number of tiles used, and the height of the rectangle.