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3rd Grade Math - Composing/Decomposing Numbers

Updated: Jan 20

This post explains and gives practice opportunities related to TEKS 3.2A:

compose and decompose numbers up to 100,000 as a sum of so many ten thousands, so many thousands, so many hundreds, so many tens, and so many ones using objects, pictorial models, and numbers, including expanded notation as appropriate


This is a very dense standard that has two major components. First, we need to understand the output this standard describes, especially expanded notation.

Once expanded notation is introduced and differentiated from expanded form, you can look at composing and decomposing numbers.

Numbers can also be decomposed in different ways simply using words.


Oral Language Development

Students process information through talking and conversing, not simply listening or watching a teacher demonstration. Here are some talk structures aligned with 3.2A to help you students unmute in the classroom.

You can find the Google Slide version here. You can also learn more about the Unmute model here.


STAAR Practice

Between 2016 and 2023 (including redesign practice), this readiness standard has been tested 10 times on the STAAR test. Videos explaining each problem can be found below. If you'd rather take a quiz over these questions, click here. The videos below are linked to each question 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.

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