[url=https://im.kendallhunt.com/MS/teachers/1/5/2/preparation.html]“Using Diagrams to Represent Addition and Subtraction”[/url] from IM Grade 6 by [url=https://www.geogebra.org/m/gus8ffvr]Open Up Resources[/url] and Illustrative Mathematics. Licensed under the [url=https://creativecommons.org/licenses/by/4.0/]Creative Commons Attribution 4.0 license[/url].
