1.
What's Your Problem?: Posing and Solving Mathematical Problems, K-2
by Penny Skinner
ISBN: 9780435083267
List Price: $36.25
2.
It All Adds Up! Engaging 8-To-12-Year-Olds in Math Investigations
by Skinner, Penny, Burns, Marilyn
ISBN: 9780941355247
List Price: $19.95