Relevant and Irrelevant Information
Lesson
Topic Index | Grade 4 Math | Elementary Test Prep | StudyZone

relevant- information that is important
irrelevant- information that is not needed

 

I own 3 dogs.  Their names are Riley, Shadow, and Tapper.  Riley is 1 years old.  Shadow and Tapper are the same age.   When you add all 3 dogs ages it equals 7. Riley is a black lab.  Shadow and Tapper are little dogs.  How old are my 3 dogs?

Let's list all of the information, and classify it as either relevant or irrelevant.

I own 3 dogs. relevant
Their names are Riley, Shadow, and Tapper.  irrelevant
Riley is 1 years old. relevant
Shadow and Tapper are the same age. relevant
When you add all 3 dogs ages it equals 7. relevant
Riley is a black lab. irrelevant
Shadow and Tapper are little dogs. irrelevant
How old are my 3 dogs? relevant

Once we see what information is important (relevant) it's easy to see how to solve the problem. 

Riley is 1
Tapper and Shadow are the same age.
1 + n + n = 7

1 + 3 + 3 = 7

The dogs are 1, 3, and 3.

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Topic Index | Grade 4 Math | Elementary Test Prep | StudyZone

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