Thank you for your interest in NCTM’s Illuminations. Beginning in mid-April, all Illuminations content will be moving to Interactives will remain openly available and NCTM members will have access to all Illuminations lessons with new filtering and search options. We hope you will continue to utilize and enjoy these resources on

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Terms of Use


All content found in the Illuminations Web site—including text, graphics, logos, button icons, images, audio clips, applets, activities and programs, as well as the collection, arrangement, and assembly of all content on the site—is the exclusive property of the National Council of Teachers of Mathematics (NCTM) and is protected by U.S. and international copyright laws.

No right, title, or interest in any permissible downloaded materials is transferred to you as a result of any such downloading. NCTM reserves complete title and full intellectual property rights in any content you download from this web site.


Illuminations is designed to provide preK-12 teachers and math educators online interactive Standards-based resources that improve the teaching and learning of mathematics for all students; and to provide materials that illuminate the vision for school mathematics set forth in Principles and Standards for School Mathematics and Common Core State Standards of Mathematics.

Student materials such as downloadable activity sheets may be reproduced by individual prek-12 educators in a quantity not greater than the class size, provided they are used only for non-commercial, classroom and instructional use and appropriately credited to Illuminations and NCTM. It is acceptable to place one or more links to Illuminations on a personal or school computer site for non-commercial, not-for-profit, educational use without express permission, provided the identity of the linked content as Illuminations content is clearly discernable to users of the link.

Except as set forth above, no part of the Illuminations content or materials may be downloaded, reproduced, modified, distributed, transmitted, replicated, or displayed in any form or by any means. Any modifications for commercial or for-profit use of the images, text, programs or other materials found in the Web site, as well as any deletions or changes to any copyright or trademark notice, is strictly prohibited.

Under no circumstances may any individual or organization charge for the use of Illuminations content and materials, independently or as a part of course packs, professional development offerings, or the like. Illuminations content and materials may not be used, reproduced, printed or linked to in any manner for the development of curriculum content or lesson plan applications by any person or entity that receives payment for such development.

Resale of Illuminations content and materials is not permitted.


The names, logos, and taglines identifying Illuminations content and services are proprietary marks of NCTM. Modifications to any logos associated with Illuminations are strictly prohibited.


While NCTM makes every effort to present accurate and reliable information on this site, NCTM does not endorse, approve or certify such information, nor does it guarantee the accuracy, completeness, efficacy, or timeliness of such information. Use of Illuminations information is voluntary. Reference on the Illuminations Website to any specific commercial product, process or service does not constitute or imply endorsement, recommendation, or favoring by NCTM. The views expressed or implied on the Illuminations Website, unless otherwise noted, should not be interpreted as official positions of the Council. The Website is provided on an "As Is" and "As Available" basis.

At certain places on this site, live "links" to third-party websites can be accessed. Such external sites contain information created, published, maintained, or otherwise posted by institutions or organizations independent of NCTM. NCTM does not endorse, approve, certify, or control these external sites and does not guarantee the accuracy, completeness, efficacy, or timeliness of information located at such sites. Use of any information obtained from such third-party sites is voluntary, and reliance on it should only be undertaken after an independent review by qualified experts. Reference in such third-party sites to any specific commercial product, process or service does not constitute or imply endorsement, recommendation, or favoring by NCTM.
NCTM assumes no responsibility for consequences resulting from use of the information contained on the Illuminations Website, or from use of the information obtained at linked third-party sites, or in any respect for the content of such information. NCTM is not responsible for, and expressly disclaims all liability for, damages of any kind arising out of use, reference to, reliance on, or performance of such information.

By your use of the Illuminations Website, you agree that NCTM and its employees, directors, officers, agents, vendors, or suppliers will not be liable for any losses or direct, indirect, incidental, consequential, exemplary, or punitive damages arising out of or in connection with your use of or inability to use the Illuminations Web site. You also are agreeing to reimburse NCTM for all losses, damages, or expenses (including court costs and reasonable attorneys’ fees) that NCTM may incur due to any violation of these terms of use.

User's Obligation to Obey Applicable Laws 

While many of the images and documents in Websites linked with Illuminations may be in the public domain, others may be protected under copyright, trademark, and other intellectual property laws of the United States and foreign countries. Such laws generally prohibit (subject to civil and criminal penalties) the unauthorized reproduction, distribution, adaptation, display, and performance of protected works. It is the user's obligation to comply with all applicable laws, including, where necessary, seeking the advice of counsel regarding the application of the fair use doctrine to the proposed educational use of materials.

Privacy Policy 

Generally speaking, you can visit the pages of the Illuminations Web site without telling us who you are or revealing any personal information. To learn more about who visits our site, we may track Internet domain addresses. While we log this domain address information, you will remain anonymous. We use this information for statistical purposes only.

NCTM is not responsible for the privacy practices or content of sites to which it provides links. You should always read the privacy policy at a website before revealing any personal information.

Acceptance of Terms 

NCTM reserves the right to update or modify these Terms of Use at any time without prior notice. Your use of the Illuminations Web site following any such change constitutes your agreement to follow and be bound by the Terms of Use as changed.

By using this site, you signify your assent to these policies. If you are dissatisfied with the Illuminations Web site, or with these terms of use, your sole and exclusive remedy is to discontinue using the site. Your use of the site is at your sole risk.