During whole group time, tell the following story to the class: You have 5 pennies (or counters) in your hand and you drop them. What are the different combinations of heads and tails that you could get? The teacher picks up 5 pennies (or counters) and drops them. By the end of the lesson students will be able to model and solve a subtraction, result unknown problemExplain their strategies for solving the problem If we drop the coins again will we end up with the same amount or different amount?