Because number lines are an integral part of mathematics after they are introduced in second grade, connecting number sense to a linear view of numbers establishes a foundation for number line use in all levels of mathematics.

### Madeline Corrigan

This manuscript describes my attitude and disposition toward mathematics at an early part in my educational career.

### Megan Holmstrom and Chris Harrow

Problems to Ponder provides 28 varying, classroom-ready mathematics problems that collectively span PK–12, arranged in the order of the grade level. Answers to the problems are available online. Individuals are encouraged to submit a problem or a collection of problems directly to mtlt@nctm.org. If published, the authors of problems will be acknowledged.

### Heidi Fee

This article shows how to empower students in their own learning by their own creation of instructional videos and assessment.

### Karen Fonkert

This department provides a space for current and past PK–12 teachers of mathematics to connect with other teachers of mathematics through their stories that lend personal and professional support.

### Tor Ormseth, Amtul Chaudry, Lacy Knight, and Susie Min

Ear to the Ground features voices from several corners of the mathematics education world.