Main Idea
&
Supportin
g Details
Wash Publishing Co. 2009
Main Idea
• The main idea is the “big point”
or the most important idea that
the writer is communicating to
the reader.
• Sometimes the reader can find
the main idea just by looking at
the title.
• For example, a passage titled:
“Why Students Should Have Less
Homework” will include reasons
for that idea.
What’s the Point?
• Read this short paragraph:
Engineers create wealth for society. So,
tennis is a game and the resources of
the earth are scarce. What is wrong
with you? Thus the only solution is to
educate the public on being socially
responsible.
DID THIS MAKE SENSE?????
OF COURSE NOT!!!
• It didn’t have a MAIN IDEA!
• We would go crazy if texts were written
like this all the time.
• It was difficult to understand because it
was made of different ideas that did not
link. There was no common thread.
• The good news is that normal passages
have main ideas!
Main Idea ma
• Main Idea - is like the heart
of the text or a paragraph.
• It is the controlling idea.
• All the other supporting details in the
text or within a paragraph should tell us
more about the main idea.
How to find the main idea?
Ask Yourself….
WHO or WHAT
is this passage
about?”
The Topic Sentence
• Many paragraphs have topic
sentences that indicate the main
idea.
• Find the topic sentence in this
paragraph:
Example:
Homeless people have many
problems. In winter, it’s hard to
stay warm and it gets too hot in
summer. It’s also hard to keep
things safe without a home.
Worst is the lack of privacy.
Supporting Details
• Supporting details helps to
explain the main idea. What
are they here?
Example:
Homeless people have many
problems. In winter, it’s hard
to stay warm and it gets too
hot in summer. It’s also hard
to keep things safe without a
home. Worst is the lack of
privacy.
Stated and Implied Main
Idea…
• Sometimes, a paragraph has a stated main idea
usually in the topic sentence. This means the
paragraph “says” what the main idea is.
• Sometimes, a paragraph doesn’t have a stated
main idea, but has an “implied” main idea. This
means that you need to state the main idea in
your own words because it doesn’t actually “say”
it in the paragraph. Let’s take a look at two
examples…
“The students had fun on their field trip. They
visited the IMG World. They were able
to tour round and they bought things
in the gift shop. After the tours, they ate
lunch at the restaurant and played with their
friends.”
The underlined portion of the sentence is the
main idea and is stated for the reader.
“The Native Americans used the trees to build
their houses. They hunted and trapped animals
in the forest for food. They found roots and
berries that they could eat. Some plants found
in the forest were used for medicine.”
In this paragraph, the main idea isn’t stated.
But, by reading the paragraph, the reader
can find the main idea: Native Americans
used things found in the forest to survive.
Too much information…
• All of the sentences in a paragraph should
support the main idea of that paragraph.
• Information that does not support the main
idea does not belong in the same paragraph.
• Take a look at the example on the next slide.
Find the “extra” information that does not
support the main idea…
“Maria offered to help her mother clean the
house. She vacuumed the living room and
dusted the furniture. She picked up the toys
in the playroom. She ate a ham sandwich for
lunch. Then, she mopped the kitchen floor.”
Which sentence does not support
the main idea?
Find the sentence that does not
support the main idea…
“Winter provides the opportunity for many
outdoor activities. Many people enjoy ice
skating on a pond. Swimming in the pond in
summer can also be fun. Skiing can be a
thrilling experience too. After a new snowfall,
you can even build a snowman!”
You try it…
“The rain forest is home to many creatures.
Monkeys, toucans and macaws live in the rain forest.
Butterflies and anteaters also live in the rain forest.”
What is the main idea?
A) Sloths and tapirs are other creatures that live in the rain forest.
B) The rain forest is home to many creatures.
C) Monkeys, toucans and macaws live in the rain forest.
Try another…
“Soccer players learn many skills when playing
soccer. Soccer players learn how to dribble and pass
the ball. They also learn how to control the ball so
they can eventually score. Most importantly, soccer
players learn how to work together with their
teammates.”
What is the main idea?
A) They also learn how to control the ball so they can eventually score.
B) Soccer players learn how to dribble.
C) Soccer players learn many skills when playing soccer.
Let’s do one more…
“Swimming is one thing that can be done at the
beach. Snorkeling is another thing that can be
enjoyed. Playing beach volleyball can be a lot of
fun. It is also fun to look for shells. Some people
simply like to sunbathe.”
What is the implied main idea?
Now…Write your own paragraph about a topic that
interests you. Underline the main idea sentence. If
you have extra time, add an illustration.
