This post explains and gives practice opportunities related to TEKS __3.6D__:

decompose composite figures formed by rectangles into non-overlapping rectangles to determine the area of the original figure using the additive property of area

## Instruction

Area of rectangles is an additive property, which means that the total area of two adjacent, non-overlapping rectangles is the sum of each of their separate areas. Here's a video showing just what that means.

## STAAR Practice

Between 2016 and 2023, this supporting standard has been tested 2 times on the STAAR test. Videos explaining the problems can be found below. If you'd rather take a quiz over these questions, click __here__. The videos below are linked to the questions in the quiz as answer explanations after the quiz is submitted.

To view all the posts in this 3rd grade TEKS review series, click __here__.

## ã‚³ãƒ¡ãƒ³ãƒˆ