I first came across the Open Middle problems after I read the Classroom Chef and jumped onto their links page (if you haven’t heard or seen it before, check it out here: classroomchef.com/links). Just like the Which One Doesn’t Belong Problems, I got pretty addicted to using these kind of problems to present challenging tasks to my students. Here are some that I have created myself:

Number: Fractions, Decimals & Percentages

Geometry

Logarithms

Arithmetic & Geometric Sequences

Linear Functions

Quadratics / Parabolas

Differentiation

Index Laws & Surds