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### Funky Protractors

*MTLT*article, “Funky Protractors for Exploring Angle Measures” by Hamilton L. Hardison. In this lesson, students recognize and justify the validity of a tool and differentiate angularity from nonangular features.

### Model Application Activity (MAA)

*MTLT*article, “Developing Statistical Modeling with Helicopters” by Katie Makar, Sue Allmond, Helen M. Doerr, and Robert C. delMas. In this lesson, students design a way to collect evidence of flight durations based on two types of paper helicopters.

### Model Exploration Activity (MXA)

*MTLT*article, “Developing Statistical Modeling with Helicopters” by Katie Makar, Sue Allmond, Helen M. Doerr, and Robert C. delMas. This lesson engages students in a model exploration activity to explore dot plots using a paper helicopter investigation.

### Model Eliciting Activity (MEA)

*MTLT*article, “Developing Statistical Modeling with Helicopters” by Katie Makar, Sue Allmond, Helen M. Doerr, and Robert C. delMas. This lesson engages students in a model eliciting activity to investigate how long a paper helicopter stays in the air.

### Make One (Face-to-Face)

*MTLT*article, “Playing with Fractions” by Juli K. Dixon, Treshonda Rutledge, Jennifer C. Caton, and Edward C. Nolan. In this lesson students model fractions with a fraction kit and reason about adding fractions with unlike denominators.

### Using Number Talks to Compare Fractions

Based on an MTLT article, the authors implement a coordinated series of well-connected number talks that allow for students to make sense of a variety of strategies that provide “flexibility” in their mathematical reasoning when comparing fractions.

### Understanding and Comparing Three-Digit Numbers

In this lesson, students will learn to make math drawings for hundreds, tens, and ones and connect the drawings to numerical symbols on layered place-value cards. Students will then compare two-digit and three-digit numbers, justifying their choices using math drawings and/or the layered place-value cards to show their classmates their reasoning.