# 3rd Grade Math - Additive Property of Area

Updated: Dec 23, 2022

This post explains and give 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 2022, this supporting standard has been tested once on the STAAR test. A video explaining the problem can be found below. If you'd rather take a quiz over this question, click __here__. The video below is linked to the question in the quiz as an answer explanation after the quiz is submitted.

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