first grade
problem 3: How many unhealthy days in our area? (page 20)
SECOND GRADE
problem 3: How many unhealthy days in our area? (page 20)
problem 4: Got healthier air in Vanderburgh? (page 28)
problem 7: Who has the cleanest car? (page 51)
THIRD GRADE
problem 3: How many unhealthy days in our area? (page 20)
problem 4: Got healthier air in Vanderburgh? (page 28)
fourth grade
problem 4: Got healthier air in Vanderburgh? (page 28)