5 papers
From conjecture generation by maintaining dragging to proof
Anna Baccaglini-Frank, Samuele Antonini
In this paper we propose a hypothesis about how different uses of maintaining dragging, either as a physical tool in a dynamic geometry environment or as a psychological tool for g…
Maintaining dragging and the pivot invariant in processes of conjecture generation
Samuele Antonini, Anna Baccaglini-Frank
In this paper, we analyze processes of conjecture generation in the context of open problems proposed in a dynamic geometry environment, when a particular dragging modality, mainta…
Educational multi-touch applications, number sense, and the homogenizing role of the educator
Anna Baccaglini-Frank
As part of an educational project proposed in Italian preschools, an educator followed a tested protocol proposing two chosen iPad apps to children of ages 5 to 6. Though her inter…
Using pivot signs to reach an inclusive definition of squares and rectangles
Maria Giuseppina Bartolini Bussi, Anna Baccaglini-Frank
We present some fragments of a teaching experiment realized in a first grade classroom, to sow the seeds for a mathematical definition of rectangles that includes squares. Within t…
Coming to see fractions on the numberline
Elisabetta Robotti, Samuele Antonini, Anna Baccaglini-Frank
The aim of this paper is to present a didactical sequence that fosters the development of meanings related to fractions, conceived as numbers that can be placed on the number line.…