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### 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.

### Getting Positive About Integer Arithmetic

In this lesson, we share a series of tasks that can support students to order and compare signed numbers and develop multiple ways to reason productively about integer addition and subtraction.### Neutralizing Reactions and Inverses

### Frustration: Analyzing a Card Game with Probability

*Frustration*.

### 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.

### Crack the Code: Algebraic Generalizing with Manipulatives

### Math Metaphors

### Pythagorean Theorem with Technology

In this lesson, students will extend the Pythagorean theorem by investigating the relationship between the areas generated by the lengths of the sides of a right triangle, investigate whether the Pythagorean theorem still holds if the shapes are not squares, and investigate whether the Pythagorean theorem still holds if the shapes are not regular.