second grade
Single Digit Addition & Subtraction
problem 2: What is the most-polluted city? (page 11)
2 Digit Subtraction
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
Single Digit Addition & Subtraction
problem 2: What is the most-polluted city? (Page 11)
2 Digit Subtraction
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)
3 Digit Subtraction
problem 5: Is our air getting cleaner? (page 34)
fourth grade
2 Digit Subtraction
problem 4: Got healthier air in Vanderburgh? (page 28)
4 Digit Subtraction
problem 1: Our path to cleaner air (page 7)
problem 5: Is our air getting cleaner? (page 34)
fifith grade
4 Digit Subtraction
problem 1: Our path to cleaner air (page 7)
5 Digit Subtraction
problem 1: Our path to cleaner air (page 7)