third grade

3-Digit Numbers

problem 46: What state produces the most coal?

problem 53: Wind race U.S. vs. China

fourth GRADE

3-Digit Numbers

problem 53: Wind race U.S. vs. China

6-Digit Numbers

problem 46: What state produces the most coal?

Decimal numbers

problem 48: Our electricity price — high or low?

fifth grade

3-Digit Numbers

problem 53: Wind race U.S. vs. China

6-Digit Numbers

problem 46: What state produces the most coal? 

Decimal numbers

problem 48: Our electricity price — high or low?