Main Idea

1. Main Idea What is it? How do I find it? What’s the difference between it and Supporting Details?

2. What is the main idea? • The main idea sentence of a paragraph tells what the paragraph is about. • The other sentences are details or small parts. They add up to the main idea. • The main idea sentence is often the first or last sentence in a paragraph, but you may find it in the middle of a paragraph too.

3. It’s like Math 8 + 9 + 7 = 24 detail + detail + detail = Main Idea The 8, 9, and 7 are like details. They are smaller than their sum, 24. The 24, like the main idea, is bigger and holds each of the smaller numbers. It is made up of smaller parts.

4. Where will the Main Idea be? Beginning End Ostriches eat grass, but they also eat wood, stones, bones and gold. In South Africa, ostriches are hunted for the diamonds that they may swallow. Ostriches in zoos have been known to eat wallets, watches, keys and coins. Ostriches will eat anything. • Ostriches will eat anything. These birds will eat grass, but they also eat wood, stones, bones and gold. In South Africa, ostriches are hunted for the diamonds that they may swallow. Ostriches in zoos have been known to eat wallets, watches, keys and coins.

5. Notice… Both paragraphs had the same information Beginning End Ostriches eat grass, but they also eat wood, stones, bones and gold. In South Africa, ostriches are hunted for the diamonds that they may swallow. Ostriches in zoos have been known to eat wallets, watches, keys and coins. Ostriches will eat anything. • Ostriches will eat anything. These birds will eat grass, but they also eat wood, stones, bones and gold.In South Africa, ostriches are hunted for the diamonds that they may swallow. Ostriches in zoos have been known to eat wallets, watches, keys and coins.

6. Some Practice • The people of ancient Egypt created an advanced civilization. More than 6,000 years ago, they developed a calendar with 360 days divided into 12 months. The people made paper and learned to write. They built huge monuments with machines they invented. • The story mainly tells • How people made paper • About the creation of Egyptian Civilization • Where an ancient calendar was invented • How the people built monuments.

7. What is this mainly about? • The people of ancient Egypt created an advanced civilization. • More than 6,000 years ago, they developed a calendar with 360 days divided into 12 months. • The people made paper and learned to write. • They built huge monuments with machines they invented.

8. What is this mainly about? • More than 6,000 years ago, they developed a calendar with 360 days divided into 12 months. –DETAIL + • The people made paper and learned to write. –DETAIL + • They built huge monuments with machines they invented. -DETAIL = • The people of ancient Egypt created an advanced civilization. - MAIN IDEA

9. Where’s the answer? • The people of ancient Egypt created an advanced civilization. More than 6,000 years ago, they developed a calendar with 360 days divided into 12 months. The people made paper and learned to write. They built huge monuments with machines they invented. • The story mainly tells • How people made paper • About the creation of Egyptian Civilization • Where an ancient calendar was invented • How the people built monuments.

10. B is the correct answer • “The people of ancient Egypt created an advanced civilization.” This is the main idea sentence. • It tells what the people did. • The other sentences are details They tell how the Egyptians were an advanced society.

11. HOWEVER… • Sometimes a story does not have a main idea sentence. It is made up only of details. • You put all the details together to find the main idea. You have to create the words for it yourself.

12. Let’s try it… • Microchips provide the power for wristwatches. They are also the brains in our computers, and they control robots. These chips are used in video games and space shuttles. They make our cameras, radios, and televisions small and light. • The story mainly tells… • How computers work • Why televisions are small • How microchips are used • How cameras are made

13. Let’s try it… • Microchips provide the power for wristwatches. They are also the brains in our computers, and they control robots. These chips are used in video games and space shuttles. They make our cameras, radios, and televisions small and light. • The story mainly tells… • How computers work (But I don’t think that’s what the WHOLE thing is about.) • Why televisions are small (again, not what the WHOLE paragraph is about) • How microchips are used (It looks like every sentence supports this statement) • How cameras are made (This isn’t even mentioned

14. MAIN IDEA STOOL!!! • So, the stool you step or sit on serves no purpose if there aren’t legs to support it. • Let’s finish this statement • A Stepping Stool is like Main Idea and Supporting Details because…

15. Practice with the stool… • Imagine testing glass by throwing chickens at it! Sometimes fast-moving airplanes fly through flocks of birds. If the birds hit the windshield of a plan, the glass could shatter and cause a crash. Airplane manufacturers have made a chicken cannon that fires rubber chickens at glass windshields If the windshield doesn’t break when the rubber chicken hits it, the designers know that the glass can withstand the force of a real crash. • The story mainly tells… a. Why birds can be dangerous to airplanes b. How a chicken cannon tests glass c. How big a bird has to be to damage an airplane d. How the chicken cannon works

17. Answer Choices (Check to see if you’re right..) • The story mainly tells… a. Why birds can be dangerous to airplanes b. How a chicken cannon tests glass c. How big a bird has to be to damage an airplane d. How the chicken cannon works

18. OK, how about another one… • The harmless hognose snake is a champion bluffer. When this snake is threatened, it hisses and acts as if it will bite. If you don’t run away, the hognose snake “plays dead.” It rolls over on its back wiggling around as if it’s in distress. Then it “dies” with its mouth open and tongue hanging out. If you turn it on its stomach, the snake will roll over on its back again. • The story mainly tells… a. Where the hognose snake is found b. What things frighten the hognose snake c. How dangerous the hognose snake is d. How the hognose snake bluffs

20. Answer Choices (Check to see if you’re right..) • The story mainly tells… a. Where the hognose snake is found b. What things frighten the hognose snake c. How dangerous the hognose snake is d. How the hognose snake bluffs

21. Now, without the obvious answer choices… • Doctors think that wearing red-tinted glasses can relieve sadness. Some people get very moody and sad in the winter,. They may be affected by the brief days. Bright lights help some people but not everyone. The reddish light coming through rose-colored glasses seems to make people feel happy.

23. Answer Choices • A. Why happy people wear rose-colored glasses • B. When some people get sad • C. How short the daylight is in winter • D. How colored glasses may help people feel better

24. And again… • The Marines had a problem in World War II. Orders were sent in code, but the enemy kept learning the code. Nothing could be kept secret. Then someone thought that Navajo soldiers could help the Marines. Since very few other people could speak Navajo, this language was used as a code. No one on the enemy side knew Navajo, sot he messages stayed a secret.

26. The story mainly tells… • How Navajo people kept secrets • When the secret code was used • How the Marines used Navajo as a code • Why the original code had to be changed