## Reflection: Connection to Prior Knowledge How Many Brownies Do I Have? : Partitioning Rectangles into Columns and Rows - Section 2: Introduction to New Material

When students are first starting to partition rectangles and squares, a common mistake is drawing extra lines.  For instance, students are asked to divide a rectangle into three columns and four rows so they draw three vertical lines and four horizontal lines and inadvertently create an extra column and an extra row.  I have several children in my class who struggled with this common misconception.  In order to support these students, I had the students start by drawing an array and then using the array to help them partition their shape.  This strategy worked well for several of my students and they were able to develop  a deeper conceptual understanding of how to partition shapes and the connection between partitioning shapes and arrays.

Common Student Mistake
Connection to Prior Knowledge: Common Student Mistake

# How Many Brownies Do I Have? : Partitioning Rectangles into Columns and Rows

Unit 9: Partitioning Shapes
Lesson 2 of 8

## Big Idea: Students use their knowledge of columns and rows to equally divide squares and rectangles.

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Standards:
Subject(s):
Math, Geometry, shapes, partitioning shape, math centers
50 minutes

### Caitlin Vaughan

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