The problem that students are working toward in this lesson is "How many bikes are there in the wheel shop if there are 18 wheels?" The lesson starts out by introducing rules in math, talking about how many bikes wheels have, and students create a rule to be able to find out how many wheels there are if they know how many bikes are there. Once they have a rule to find the number of bikes, learners are pushed to think algebraically so they can figure out how many bikes there are if they know how many wheels there are in total. The activity requires group work, critical thinking, the use of manipulatives, for students to record their thinking and to talk about what other groups did. Comparing and contrasting will help students to see that there are multiple ways in which to figure out a problem.
This lesson addresses these CCSSs:
2.MP.2 Reason abstractly and quantitatively.
2.MP.3 Construct viable arguments and critique the reasoning of others.
2.OA.C Work with equal groups of objects to gain foundations for multiplication.
2.OA.3 Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.