1권
Science
| UNIT 01 | What Is a Desert?
| UNIT 02 | Water Cycle
| UNIT 03 | Alligators and Crocodiles
| UNIT 04 | Forests
| UNIT 05 | Insects
| UNIT 06 | The Solar System
| UNIT 07 | Climate
| UNIT 08 | What Is Light?
Social Studies
| UNIT 09 | The Mighty River: The Nile
| UNIT 10 | The Statue of Liberty
| UNIT 11 | Abraham Lincoln
| UNIT 12 | Helen Keller
| UNIT 13 | The First Thanksgiving
| UNIT 14 | The Wild West
| UNIT 15 | Good Citizens
| UNIT 16 | Chinese New Year
Language Arts
| UNIT 17 | The Magic Pot
| UNIT 18 | How Man Got Fire
Math
| UNIT 19 | Fingers, Rocks, and Bones
| UNIT 20 | A Smart Counter

2권
Science
| UNIT 01 | Severe Weather
| UNIT 02 | Four Seasons
| UNIT 03 | Rainforests of the Sea
| UNIT 04 | What Flowers Do
| UNIT 05 | Butterflies and Moths
| UNIT 06 | Stars and Planets
| UNIT 07 | Volcanoes
| UNIT 08 | Sound
Social Studies
| UNIT 09 | Rocky Mountains
| UNIT 10 | The Great Wall of China
| UNIT 11 | George Washington: The First President
| UNIT 12 | Martin Luther King
| UNIT 13 | Immigrants to America
| UNIT 14 | The Civil War
| UNIT 15 | Recycling: A Way to Save
| UNIT 16 | Who Is Santa Claus?
Language Arts
| UNIT 17 | The Ten Suns
| UNIT 18 | Tikki Tikki Tembo
Math
| UNIT 19 | Using Estimation Strategies
| UNIT 20 | They Travel in Fives

3권
Science
| UNIT 01 | Tornadoes: Severe Thunderstorms
| UNIT 02 | Different Types of Pollution
| UNIT 03 | Life in the Polar Regions
| UNIT 04 | What Roots Do
| UNIT 05 | Ants Are Social Insects
| UNIT 06 | Black Holes
| UNIT 07 | The Causes of Earthquakes
| UNIT 08 | Everything Is Matter
Social Studies
| UNIT 09 | The Grand Canyon
| UNIT 10 | The Eiffel Tower
| UNIT 11 | Inventing the Telephone
| UNIT 12 | Henry Ford: An Icon of the Modern Automobile
| UNIT 13 | Pompeii Comes Alive
| UNIT 14 | A Great Earthquake Hits San Francisco
| UNIT 15 | Endangered Animals
| UNIT 16 | Stars on Flags
Language Arts
| UNIT 17 | The Hunter and the Crocodiles
| UNIT 18 | How Springtime Comes
Math
| UNIT 19 | Why We Need Fractions
| UNIT 20 | Even and Odd: Strange Cousins