### SECOND GRADE

problem 16: How much of Earth’s water can we use? (percentages)

### THIRD GRADE

problem 16: How much of Earth’s water can we use? (percentages)

### FOURTH GRADE

problem 13:Who makes harmful gas? (converting percentages to fractions & decimals)

problem 16: How much of Earth’s water can we use? (converting percentages to fractions & decimals)

problem 17: Which continent has the most water? (converting percentages to fractions & decimals)

problem 38: How much bottles is recycled? (converting percentages to fractions & decimals)

problem 47: Energy sources in our state

### FIFITH GRADE

problem 13:Who makes harmful gas? (converting percentages to fractions & decimals)

problem 16: How much of Earth’s water can we use? (converting percentages to fractions & decimals)

problem 17: Which continent has the most water? (converting percentages to fractions & decimals)

problem 30: What makes our trash? (converting percentages to fractions & decimals)

problem 38: How much bottles is recycled? (converting percentages to fractions & decimals)