5. © Steven Kazlowski/SuperStock

6. 1 Web Search How big is the average human? What units might you use to describe weight and height? 2 Web Search How big is the average killer whale? What units might you use to describe weight and height? 3 Image Search Look up images of killer whales and images of humans. Based on these pictures, can you estimate what the fraction will be? Why or why not? 4 Thinking Would two humans automatically be the same fraction of the size of a killer whale? Why or why not? What would it mean if they were equivalent fractions? 5 Thinking You could also go about solving this by thinking about how many humans it would take to equal the size of a killer whale. If you had this estimation, how could you then create a fraction that represents each human?

8. 1 Web Search How big is the average human? What units might you use to describe weight and height? 2 Web Search How big is the average killer whale? What units might you use to describe weight and height? 3 Image Search Look up images of killer whales and images of humans. Based on these pictures, can you estimate what the fraction will be? Why or why not? 4 Thinking Would two humans automatically be the same fraction of the size of a killer whale? Why or why not? What would it mean if they were equivalent fractions? 5 Thinking You could also go about solving this by thinking about how many humans it would take to equal the size of a killer whale. If you had this estimation, how could you then create a fraction that represents each human?

9. 1 Web Search How big is the average human? What units might you use to describe weight and height? 2 Web Search How big is the average killer whale? What units might you use to describe weight and height? 3 Image Search Look up images of killer whales and images of humans. Based on these pictures, can you estimate what the fraction will be? Why or why not? 4 Thinking Would two humans automatically be the same fraction of the size of a killer whale? Why or why not? What would it mean if they were equivalent fractions? 5 Thinking You could also go about solving this by thinking about how many humans it would take to equal the size of a killer whale. If you had this estimation, how could you then create a fraction that represents each human?

10. 1 Web Search How big is the average human? What units might you use to describe weight and height? 2 Web Search How big is the average killer whale? What units might you use to describe weight and height? 3 Image Search Look up images of killer whales and images of humans. Based on these pictures, can you estimate what the fraction will be? Why or why not? 4 Thinking Would two humans automatically be the same fraction of the size of a killer whale? Why or why not? What would it mean if they were equivalent fractions? 5 Thinking You could also go about solving this by thinking about how many humans it would take to equal the size of a killer whale. If you had this estimation, how could you then create a fraction that represents each human?

11. 1 Web Search How big is the average human? What units might you use to describe weight and height? 2 Web Search How big is the average killer whale? What units might you use to describe weight and height? 3 Image Search Look up images of killer whales and images of humans. Based on these pictures, can you estimate what the fraction will be? Why or why not? 4 Thinking Would two humans automatically be the same fraction of the size of a killer whale? Why or why not? What would it mean if they were equivalent fractions? 5 Thinking You could also go about solving this by thinking about how many humans it would take to equal the size of a killer whale. If you had this estimation, how could you then create a fraction that represents each human?

12. 1 Web Search How big is the average human? What units might you use to describe weight and height? 2 Web Search How big is the average killer whale? What units might you use to describe weight and height? 3 Image Search Look up images of killer whales and images of humans. Based on these pictures, can you estimate what the fraction will be? Why or why not? 4 Thinking Would two humans automatically be the same fraction of the size of a killer whale? Why or why not? What would it mean if they were equivalent fractions? 5 Thinking You could also go about solving this by thinking about how many humans it would take to equal the size of a killer whale. If you had this estimation, how could you then create a fraction that represents each human?

13. 1 Web Search How big is the average human? What units might you use to describe weight and height? 2 Web Search How big is the average killer whale? What units might you use to describe weight and height? 3 Image Search Look up images of killer whales and images of humans. Based on these pictures, can you estimate what the fraction will be? Why or why not? 4 Thinking Would two humans automatically be the same fraction of the size of a killer whale? Why or why not? What would it mean if they were equivalent fractions? 5 Thinking You could also go about solving this by thinking about how many humans it would take to equal the size of a killer whale. If you had this estimation, how could you then create a fraction that represents each human?