The Doorbell Rang by Pat Hutchins
A good book to introduce dividing decimals (the 18 divided by 4 activity)This is an excellent launch story for this writing activity I have used in several times and it lends itself to this writing activity very well.

NCTM's Mathematics Teaching in the Middle School has two recent issues that focus on writing in math.
November 2007
October 2007

A Grain of Rice
Stop on p. 43 to work the problem.
Every site will have a classroom set of 30 that teachers can check out for use in their classroom.

Suggested Books for Literature Connections

The Dot and the Line
The Number Devil
The Further Adventures of Penrose the Mathematical Cat
Sir Cumference series
What's My Angle