Day 1, cookie monster eats 1/2 a cookie. Each day that follows, he eats 1/2 of what is remaining. By day 7, how much of the cookie has he eaten?

1. Cookie Monster
Problem Solving with Fractions

2. The cookie
monster sneaks
into the kitchen
and eats 1/2 a
cookie.

3. On the second day...
•On the second day, he ate
half of what remained of the
cookie from the first day.

4. On the third day...
•On the third day, he ate half of
what remained of the cookie
from the second day.

5. And so on...
•If the cookie monster continues the
process for seven days, how much of the
cookie has he eaten?
•How much is left?
•Will he ever eat the whole cookie?

6. Where are the MPs?
•Please consider how each of the Standards for
Mathematical Practice apply, especially:
• MP1
• MP2
• MP3
• MP7