Main Idea & Supporting Details

What is the best question to ask yourself when you are trying to find the main idea?

The topic of a text can often be found in the title or in the opening paragraph of the text.

What is the topic in the following paragraph?

Shanna had never seen so many fish before. She looked around at the huge tanks and could see hundreds of fish, crabs, shrimp, and all other amazing creatures completely surrounding her. She never thought she could feel like she was completely underwater, yet still be completely dry.

What is the main idea of the following paragraph?

Floods can cause tremendous damage. They can ruin houses, roads and buildings. Floods can take down trees and cause mudslides. It often leaves mud, sand and debris behind. It can take months to clean up after a flood.

What is the main idea of the following paragraph?

Sharks can lose up to 30,000 teeth in their lifetime. Sharks have teeth arranged in rows inside their mouths. These teeth do not have roots like human teeth do, so they fall out easily. When a shark takes a powerful bite into its food, several teeth are lost. When these teeth are lost, new ones push forward from the back rows to replace them. Luckily, sharks continually grow new teeth to replace the thousands they lose.

What is the main idea of the following paragraph?

Animals and plants living in deserts have adaptations which enable them to survive there. Desert plants have little or no leaves where moisture can escape. They also have deep roots to soak up water underground. Many desert animals are nocturnal. They burrow in the soil or sand during the hottest part of the day and are active at night when it is cooler. Desert animals also survive by getting the water they need from desert plants.