1. What's My Rule?

1A. IN 123456789

OUT 937557391

1B. IN 123456789

OUT 335443554

1C. IN 123456789

OUT OTTFFSSEN

1D. IN 123456789

OUT UDTQCSSHN

2. Which number comes next in the sequence?

2A. 3, 5, 7, 9, 11, 13, 15, 17, 19, ?

2B. 3, 5, 7, 11, 13, 17, 19, ?

2C. 2, 5, 10, 17, 26, 37, 50, 65, 82, ?

2D. 1, 2, 4, 8, 16, 32, 64, 128, ?

2E. 1, 1, 2, 3, 5, 7, 12, 19, 27, ?

3. 1988-1989 6th grade math contest (solutions)

1987-1988 6th grade math contest

**Source: The Math League**
** http://www.mathleague.com**

4. Problems of the Week (solutions)

4A. Middle School - Seating Dilemma

4B. Elementary School - Across the Netherlands

**Source: The Math Forum**
** 4A.
http://forum.swarthmore.edu/midpow/solutions/solution.ehtml?puzzle=68**
** 4B.
http://forum.swarthmore.edu/elempow/solutions/solution.ehtml?puzzle=64**

Don Braffitt