Identifying the
Main Idea and Supporting Details


Nonfiction text is so exciting and interesting.  It requires us to read slower so that we can identify what is important information and all the fascinating details that make that information so interesting.  If you missed the lesson on 'Main Idea and Supporting Details' or need a review, please continue reading...
Please read the following paragraph:

  Ugh!  My camera is all slimy.  I was trying to photograph a humpback whale as he blew from his blow hole.  It was too close!  When a humpback whale breathes, it blows air and water vapor out its blow hole on the top of its head.  The whale's breath, forced out the hole at 450 kph, is composed of air and water vapor; it can reach 5 meters high and seen from 2 kilometers away on a clear day.  It contains a fishy smell and oily substance, which can leave a residue on a camera lens, if too close.  Whale's breathing or 'the blow' is usually the first sign that a whale is present.

 


What is the main idea of the paragraph?  What is the paragraph telling us about the whale?  What idea keeps being explored?
 
  Please re-read the paragraph again ... focus on what idea keeps being discussed.

  Ugh!  My camera is all slimy.  I was trying to photograph a humpback whale as he blew from his blow hole.  It was too close!  When a humpback whale breathes, it blows air and water vapor out its blow hole on the top of its head.  The whale's breath, forced out the hole at 450 kph, is composed of air and water vapor; it can reach 5 meters high and seen from 2 kilometers away on a clear day.  It contains a fishy smell and oily substance, which can leave a residue on a camera lens, if too close.  Whale's breathing or 'the blow' is usually the first sign that a whale is present.

The yellow highlighted words, above and listed below, all refer to the breath of the whale.

blew
breathes
whales' breath
breathing
'the blow'

After looking at the words listed above, what is the main idea?
 


All the words have to do with the whale's breath or 'the blow'.
 
If that is the main idea, then there should be supporting details.  Can you find them?
 
Please re-read the paragraph to locate the supporting details.

  Ugh!  My camera is all slimy.  I was trying to photograph a humpback whale as he blew from his blow hole.  It was too close!  When a humpback whale breathes, it blows air and water vapor out its blow hole on the top of its head.  The whale's breath, forced out the hole at 450 kph, is composed of air and water vapor; it can reach 5 meters high and seen from 2 kilometers away on a clear day.  It contains a fishy smell and oily substance, which can leave a residue on a camera lens, if too close.  Whale's breathing or 'the blow' is usually the first sign that a whale is present.
 

Do the words highlighted in blue give you further information about the main idea: the whale's breath or 'the blow'?
 
Yes, each provides more specific information.

If you were making notes, you might write them the following way:

 

Whale's breath
   air and water vapor
   fishy smell
   oily residue
   5 meters high
   visible - 2 kilometers
   force - 450 kph
   expels from blow hole - top of head
   first sign whale nearby
 

REMEMBER:

Reading nonfiction text usually means reading more than once to understand the information being presented.


?   Read to see if the information is what you need.

?   Re-Read to identify the main idea

?   Re-Read to identify the details that explain the main idea.

 

Last updated: September 26, 2004
Copyright 2004 Dover-Sherborn Regional School District, All Rights Reserved  Disclaimer

Created by Cheryl Caskie Chase, Teacher-Librarian
Thanks to the fourth grade teachers, at Chickering School, for collaborating on this Inquiry Model.
Chickering School
 Dover, Massachusetts 02030

MSLMA - Baltimore County, MD Collaboration Project, Summer 2004
Thanks to all our friends in Baltimore Country for their gracious assistance in teaching and working with us.