This is an introduction to combining like terms. A storm has hit the zoo and all of the animals are roaming free. They have to be placed back into their pens. There are three monkeys over here, 6 penguins over there, 2 more monkeys there. (3M + 6P + 2M) Students combine like terms by putting them in the correct "pen". There are 3 pages for teacher to lead students together in practice, followed by an independent practice sheet with answer sheet.