Factor-Puzzle
Dragging b and d across the vertical divider reveals that the product of their secret numerical values is 30.
Factor-Puzzle
Daniel Scher
Daniel Scher co-directed two NSF-funded projects: the Dynamic Number project and the Forging Connections project. He has worked at EDC, Best Practices in Education, KCP Technologies, and McGraw Hill. He has taught as an adjunct at New York University and City College.