So here is my first free activity. You can download this activity for FREE at Teachers Pay Teacher using the following link:
I hope you enjoy this activity. It is a great activity to engage students in problem solving while practicing accuracy of addition with large numbers. While the picture book provides some great pictures, you can also do this lesson using the printable story at the link below.
Printable Story: http://jwilson.coe.uga.edu/EMT668/EMAT6680.F99/Martin/instructional%20unit/day4.exponential/excel/grainofrice.html
Buy the Book: