Math Mystery Week- Day Four

You made it to Day Four of Math Mystery Week! You're almost there! I have a new pattern for you and your team to solve. Read the blog post and then follow the directions to post your comment.

Here is the pattern for today! Look closely to see if you can find it...


21,17,13,9,5,1

Do you see a pattern? Once you have, respond to the following in a comment:

• What is the pattern?
• Explain WHY the pattern works. Tell me what you are thinking. 
• Compare this pattern to the other patterns we learned this week.
  
• Once you have posted your own answer, read the other teams answers and ask any questions you may have about their explanation.