Chapter 5:

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• Chapter 5
• Look for a Pattern

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• While jogging, Shawna noticed that dogs would
  hear her and bark. After the first dog had barked
  for about 15 seconds, two other dogs would join
  in and bark. In about another 15 seconds, it
  seemed that each barking dog would inspire two
  more dogs to start barking. Of course, long after
  Shawna passed the first dog, it continued to
  bark, as dogs are inclined to do. After about 3
  minutes, how many dogs were barking (as a result
  of Shawna's passing the first dog)?

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Try ideas.

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Write down a sequence.

• 1 dog
• 1 2 3 dogs
• 3 6 9 dogs

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Make a chart.
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Calculate differences.
2
6
18
54
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Try other operations as needed.
x 3
x 3
x 3
x 3
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Describe the pattern with symbols.

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Strategy Look for a pattern

• Write down the sequence, and extend it if you can.

• Make a chart.
• Calculate differences.
• Try other operations as needed.
• Describe the pattern with symbols.