## Search Results ### Perimeter Exploration: Exploring How the Perimeter of a Polygon Can Change While Its Area Remains Constant

3-5
In this lesson, students explore the relationship between perimeter and area. Students use pattern blocks to build polygons to explore how the perimeter can be different for two or more polygons with the same area. ### Odd Man Out: Identifying Sums of Numbers as Odd or Even

Pre-K-2, 3-5
In this lesson, students use a visual model using snap cubes or grid paper to build numbers in two columns to show whether they are odd or even. They then use the models to generalize about sums of odd and even numbers. ### Polygons, Perimeter, and Patterns: Discovering the Algebra in Perimeter Patterns

3-5
In this lesson, students use pattern blocks to create polygon "chains" and calculate the perimeter of the trains as they get longer. The students will recognize and create patterns based on adding the same shape repeatedly to the train. The students then write algebraic expressions to describe the patterns. ### Trying Out Tangrams: Applying Knowledge of Geometry Vocabulary

3-5
In this lesson, students develop their understanding of the terms quadrilateral, parallel, and right angle. They apply that understanding in problem-solving activities with tangrams. ### Elapsed Time: Using a Timeline to Determine Elapsed Time

3-5
Students learn to calculate elapsed time by using a timeline, and then complete three engaging and fun activities that plan a circus performance, their class schedule, and their day. ### Getting to Know the Solids

3-5
Students are introduced to some of the basic polyhedra. Students explore the shapes of the faces of these solids. ### Inversions

3-5, 6-8

Using inversions — words that can be read in more than one way — as the context, students will be introduced to various types of symmetry. After exploring the symmetries that exist with letters of the alphabet, they will make inversions of their own name. 3-5, 6-8
In this activity for grades 4-6, students attempt to identify the concept of a million by working with smaller numerical units, such as blocks of 10 or 100, and then expanding the idea by multiplication or repeated addition until a million is reached. Additionally, they use critical thinking to analyze situations and to identify mathematical patterns that will enable them to develop the concept of very large numbers. ### Math Vocabulary Bingo

3-5, 6-8
This lesson provides students an opportunity to assess their understanding of mathematical vocabulary as they relate to key concepts from the five content areas. Through the use of a familiar game format, Bingo, students will identify numbers 0‑75 that correspond to mathematical descriptions from math vocabulary clue cards. 