An escape room can be a great way for students to apply and practice mathematics they have learned. This article describes the development and implementation of a mathematical escape room with important principles to incorporate in escape rooms to help students persevere in problem solving.

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### Tim Erickson

We modify a traditional bouncing ball activity for introducing exponential functions by modeling the time between bounces instead of the bounce heights. As a consequence, we can also model the total time of bouncing using an infinite geometric series.

### John K. Lannin, Delinda van Garderen and Jessica Kamuru

This manuscript discusses two important ideas for developing student foundational understanding of the number line: (a) student views of the number sequence, and (b) recognizing units on the number line. Various student strategies and activities are included.

### Gabriel Matney, Julia Porcella and Shannon Gladieux

This article shares the importance of giving K-12 students opportunities to develop spatial sense. We explain how we designed Quick Blocks as an activity to engage our students in both spatial reasoning and number sense. Several examples of students thinking are shared as well as a classroom dialogue.

### Jerra Wood

A flight simulator presents a new STEM slant on students' knowledge of linear equations.

### Melissa A. Stoner, Kristin T. Stuby and Susan Szczepanski

By implementing high-impact activities, such as designing a school and a skate park, mathematical thinking can be linked to the engineering design process.

### Toni M. Smith, Padmanabhan Seshaiyer, Nathalia Peixoto, Jennifer M. Suh, Graham Bagshaw and Laurena K. Collins

Two activities help develop students' understandings of rate of change and slope within STEM contexts.

### Kasi C. Allen

A compelling contest motivates students and makes mathematics and STEM relevant.