# Put the Point on the Line

The goal of this activity is to sharpen students’ focus on slope. As students place points on an imaginary line, the activity asks them to estimate first, then calculate, and then notice proportionality.

Use student ideas here to define slope as a ratio of change in y-coordinates to change in x-coordinates. By the time students get to the end of the activity, they should have a number of ways of talking about this, but it’s unlikely they’ll write a fraction with Δy in the numerator and Δx in the denominator. They’ll be ready for you to introduce this idea.

## Marcellus the Giant

This activity will help your students understand the definition of a proportional relationship. They'll create a giant and then make sure all of his features are proportional. They'll see the…

## What’s My Number?

In this activity students develop their intuition for mean absolute deviation. We start with a simple question: "Can you guess my number?" Students submit a guess, receive feedback (too low,…

This Custom Polygraph is designed to spark vocabulary-rich conversations about fractions and part-to-whole relationships. Key vocabulary that may appear in student questions includes: shaded, unshaded, fraction, part, whole, numerator, denominator,…

## Strength in Numbers

In this activity, students complete three rounds of estimation challenges. After each initial estimate, they view a dot plot of their classmates' responses and decide whether (and how) to revise…

## Card Sort: Exponentials

In this activity, students practice what they've learned about exponential functions by matching equations to properties of the graphs they will produce. They will then use their knowledge of transforming…

## Classy Cats

In this activity, students will begin to see a set of data points as a single thing that can be analyzed, not just a bunch of disconnected points. Students learn…