### NUMBER & OPERATIONS

#### ADDITION & SUBTRACTIOIN

2-Digit Numbers

problem 7: Who has the cleanest car?

problem 22: Apple vs. Hamburger: Which takes more water to produce?

problem 24: How can I save water?

#### <,>&= SYMBOLS

problem 3: How many unhealthy days in our area?

problem 7: Who has the cleanest car?

problem 43: Do we use lots of energy?

problem 45: How many coal mines does our community have?

#### percentages, fractions & decimals

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

#### multiplication & division

problem 23: How much water do I use?

### data analysis

#### bar graphs

1-Digit Numbers

problem 4: Got healthier air in Evansville?

problem 12: What makes harmful gas?

problem 45: How many coal mines does our community have?

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?

problem 43: Do we use lots of energy?

#### Circle graphs

problem 17: Which continent has the most water?

problem 42: Our nation’s energy sources (number comparison)

problem 47: Energy sources in our state (number comparison)