Checkpoint 2.3: Support decoding of text, mathematical notation, and symbols- There are teaching tools used in this site to show you the logical breakdown is for mathematical problems. These styles are mentioned and sourced by certified educators. 

Engagement-Checkpoint 7.1: Optimize individual choice and autonomy- Students have multiple options to choose from. The delivery should be given as a choice to the student to complete and will help with the motivation to complete assignments.
Checkpoint 8.4: Increase mastery-orientated feedback- Just like taking a test or quiz, there is always feedback that can be presented. The student should be able to see the answers from the assignment and ask questions to gain clarity.

Action of Expression-Checkpoint 5.2: Use multiple tools for construction and competition- As mentioned before, the website has several options in the format of the math lessons. Students may also use calculators if permitted.

8. Math Games
https://www.mathgames.com/
Math Games is a source of math tools that helps grades Prekindergarten to 8th grade. The site contains over 15 digital math games to help with practice, generalization, and mastery of level of math. The site focuses on games, skill level, and worksheets catered to each student for every level they are own up until the 8th grade. Most importantly, the site is trusted and free to the public.
UDL Checkpoints:
Engagement:Checkpoint 8.1: Heighten salience of goals and objectives-The Math Games website correlates math assignments that are Common Core Standards. This means that the math presented on the site is the same materials that the students will be tested on.
Checkpoint 8.2: Vary demands and resources to optimize challenge- there are worksheets, games, and quizzes for each skill level and for every grade.
Representation:
Checkpoint 2.5: Illustrate through multiple media- In addition to the variety of games. the site offers a digital form of textbook. 
Action and Expression:
Checkpoint 5.3: Build fluencies with graduated levels of support for practice and performance- Math games has access to all different levels of learning. If the student is not challenged with math on specific skill and grade level, they can adjust the meter for learning. Also, each completed assignment, quiz, and task may be reviewed at any given time.
9. Prodigy
https://www.prodigygame.com/
Prodigy is a source used by teachers, parents, and students. It is completely free and can be used in both the school and at home. Prodigy provides games for math students form 1st grade to 8th grade. Although the site is noted for games, it also allows the data to be collected and kept of file for access to the teacher or parent. Prodigy also allows differentiation among skill levels based on the student's progress.
UDL Checkpoints:
Engagement:
Checkpoint 7.2: Optimize relevance, value, and authenticity- there are different games that a provided that meet the level of criteria specific to each skill level.
Checkpoint 8.4: Increase mastery-orientated feedback- While playing math games is fun, the source does show the percentage of accuracy at the end of each completed game.
Representation:
Checkpoint 3.2: Highlight patterns, critical features, big ideas, and relationships- adults may see a pattern of areas that need to be addressed based off of data that the site keeps for each student. This will then determine what level needs to be addressed or what skill level needs to be addressed.
Actions and Expressions:
Checkpoint 5.3: Build fluencies with graduated levels of support for practice and performance- there is a data tracking source that shows the deficit areas of math for the student. The teacher/parent may take this data and apply differential learning to best fit the learner's needs.

10. Math is Fun
https://www.mathsisfun.com/
Math is Fun was designed to help students in math from kindergarten up to the precalculas level. There are several learning tools used from games, worksheets, dictionaries, measuring tools, and quizzes.
UDL Checkpoints:
Engagement:
Checkpoint 7.2: Optimize relevance, value, and authenticity- students are given the freedom to choose which task they want to complete. This site helps educators and parents, but the students can access this site as well using valid log in information.
Representation:
Checkpoint 2.1: Clarify vocabulary and symbols- there is a dictionary that is provided and includes a breakdown of the meanings.
Checkpoint 2.4: Promote understanding across languages- this site has over 20 different languages to choose from all at the click of a button.
Checkpoint 2.5: Illustrate through multiple media- the site can be shared on Facebook, twitter, email, pinterest, etc.

Actions and Expressions:
Checkpoint 5.1: Use multiple media for communication- along with the different forms of learning, activities may be shared across various platforms.
Checkpoint 5.2: Use multiple tools for construction and competition-the site has measuring tools, quizzes, data sheets, graphs, and worksheets all just to name a few different tools that are available for learning.

Action and Expression:
Checkpoint 5.3: Build fluencies with graduated levels of support for practice and performance-there are several opportunities to make sure that the material is being learned with taking quizzes and completing worksheets. Teachers and parents can monitor the progress of the student.

Engagement- Checkpoint 7.1: Optimize individual choice and autonomy- the students have many different opportunities to self explore the free website. It is easy to navigate and has several options to choose/learn from.
Checkpoint 8.4: Increase mastery-orientated feedback- this tool offers worksheets to help with comprehension of materials as well as a quiz after each section is completed.
Representation- Checkpoint 1.2: Offer alternatives for auditory information- There are visual aids for each lesson, hyperlinked, and tabs accessible to the user. Checkpoint 1.3: Offer alternatives for visual information- this website contains several videos with sound to listen to some lectures. 

Action and Expression-
Checkpoint 5.3: To build fluency with graduated levels of support for practice and performance- fluency is built through completing the worksheets, answers available to score student's progress. The completed quizzes is also a form of showing graduated levels of support for practice and performance. 

3. Smithsonian Learning Lab
https://learninglab.si.edu/
The Smithsonian Learning Lab was designed to help the educators and parents discover the platform that was built for learners to engage in learning to understand history, art, culture, and the sciences through inquiry and analysis. This website gives you an opportunity to create new ideas or even use past ideas a examples for you to deliver in your teaching style.
UDL Checkpoints:
Engagement:
Checkpoint 8.3: Foster collaboration and community- There is an option to share the information that you learn, or add to the website. This website encourages that you share the knowledge from the Smithsonian with you community. The social media stages that are easy to access for shareable files are twitter, Facebook, and email just to name a few.
Representation:
Checkpoint 2.5: Illustrate through multiple media- there are articles, blogs, videos, journals, activities, projects etc that help stage multiple areas of media using this tool.
Checkpoint 3.1: Activate or supply background knowledge- There are journals, recent blogs, and articles that the Smithsonian uses to support learning materials. There is a broad mixture of materials from prehistoric events, to current events (Covid-19) that supports the website having background knowledge. The Smithsonian Lab online is sourced directly from the Smithsonian Museum.
Action and Expression:
Checkpoint 5.1: Use multiple media for communication- journal articles, research, data, and videos are all multiple media for communication as well as the social media platforms mentioned earlier.