### SECOND GRADE

1-Digit Numbers

problem 4: Got healthier air in Evansville?

problem 12: What makes harmful gas?

2-Digit Numbers

problem 3: How many unhealthy days in our area?(creating bar graphs)

problem 3: How many unhealthy days in our area? (interpreting bar graphs)

problem 4: Got healthier air in Evansville?

problem 7: Who has the cleanest car?

### THIRD GRADE

1-digit numbers

problem 4: Got healthier air in Evansville?

problem 12: What makes harmful gas?

2-Digit Numbers

problem 3: How many unhealthy days in our area?(creating bar graphs)

problem 3: How many unhealthy days in our area? (interpreting bar graphs)

problem 4: Got healthier air in Evansville?

problem 7: Who has the cleanest car?

3-digit numbers

problem 14: How big is our harmful gas? (using ordinal numbers)

problem 14: How big is our harmful gas? (using addition & subtraction)

### FOURTH GRADE

1-digit numbers

problem 4: Got healthier air in Evansville?

problem 12: What makes harmful gas?

2-Digit Numbers

problem 3: How many unhealthy days in our area?(creating bar graphs)

problem 3: How many unhealthy days in our area? (interpreting bar graphs)

problem 4: Got healthier air in Evansville?

problem 7: Who has the cleanest car?

3-digit numbers

problem 14: How big is our harmful gas? (using ordinal numbers)

problem 14: How big is our harmful gas? (using addition & subtraction)

### FIFTH GRADE

2-Digit Numbers

problem 3: How many unhealthy days in our area?(creating bar graphs)

problem 3: How many unhealthy days in our area? (interpreting bar graphs)

problem 4: Got healthier air in Evansville?

problem 7: Who has the cleanest car?