This is the Project MathTalk homepage that has videos on the following topics: Parabolas, Proportions, Algebraic Expressions, Exponentials, Logarithms, Binomials, Trigonometry, and more.  Over 400 FREE, short, online videos that feature students working on mathematics problems and resolving their struggles through conversation. The instructional approach to the videos draws on evidence-based practices from the latest research in mathematics education. Engaging with the videos enables learners to explore conceptually rich mathematics problems by watching other students talk about math problems via an accessible online platform. The site also contains useful materials for teachers, researchers, and teacher educators. 

Explore Algebraic Expressions in this free video unit. It is comprised of 6 lessons with 4-7 short videos in each lesson. Featuring the reasoning of Grade 9 students, the unit explores how to generalize arithmetic to algebra and relate algebraic symbols to their meaning in context. The videos provide a foundation for the Common Core State Standards about equivalent forms of functional relationships. Showing these videos is great for helping students develop meaning for algebraic expressions beyond symbol manuipulation. 

Explore Binomials in this free video unit. It is comprised of 6 lessons with 7-8 short videos in each lesson. Featuring the reasoning of Grade 10 students, the unit moves beyond the procedure of FOIL by exploring the “why” behind multiplication of binomials. The videos provide a foundation for the Common Core State Standards about performing operations on polynomials. Showing these videos can help students become more comfortable operating binomials by grounding the operations in real-world contexts. 

Explore Exponentials in this free video unit. It is comprised of 7 lessons with 4-7 short videos in each lesson. Featuring the reasoning of Grade 8 students, the unit explores generalizing and graphing exponential functions through the use of a dynamic applet. Show these videos to help students visualize exponential growth in a real-world context and make sense of fractional exponents. 

Explore Logarithms in this free video unit. It is comprised of 6 lessons with 4-7 short videos in each lesson. Featuring the reasoning of Grade 8 students, the unit explores exponential and logarithmic properties and their relationship. The videos provide a foundation for the Common Core State Standards about understanding the inverse relationship between exponents and logarithms. Showing these videos may help teachers that want to help students move fluently between exponential and logarithmic expressions.  

Explore Parabolas in this free video unit as a part of Project MathTalk. It is comprised of 10 lessons with 5-7 short videos in each lesson. Featuring the reasoning of Grade 10 students, the unit explores how to make sense of the geometric definition of a parabola. The videos provide a foundation for the Common Core State Standard: “Derive the equation of a parabola given a focus and directrix.” Showing these videos are great for classrooms that want to make connections between Geometry and Algebra. 

Explore Proportions in this free video unit. It is comprised of 7 lessons with 4-6 short videos in each lesson. Featuring the reasoning of Grade 6 students, the unit explores how to form and iterate ratios through the use of a dynamic applet. The videos provide a foundation for the Common Core State Standards about using ratios and rates to solve math problems. Showing these videos are helpful for teachers who want to move students from reasoning additively to forming multiplicative comparisons. 

Explore Trigonometry in this free video unit. It is comprised of 8 lessons with 4-6 short videos in each lesson. Featuring the reasoning of Grade 11 students, the unit explores explores the concepts of angle measure and the sine function. The videos provide a foundation for the Common Core State Standard covering trigonometric concepts. Show these videos to help students build intuition for difficult trigonometric ideas, like moving fluidly between angles and radians and using trigonometric functions to model real world data.