Here are links to Khan Academy for 8th Grade Illustrative Math (Open Up Resources).
Entire Unit: https://www.khanacademy.org/math/8th-grade-illustrative-math
Unit One: Rigid Transformations and Congruence
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-1-rigid-transformations-and-congruence
Unit Two: Dilations, Similarity, and Introducing Slope
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-2-dilations-similarity-and-introducing-slope
Unit Three: Linear Relationships
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-3-linear-relationships
Unit Four: Linear Equations and Linear Systems
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-3-linear-relationships
Unit Five: Functions and Volume
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-5-functions-and-volume
Unit Six: Associations in Data
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-6-associations-in-data
Unit Seven: Exponents and Scientific Notation
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-6-associations-in-data
Unit Eight: Pythagorean Theorem and Irrational Numbers
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-8-pythagorean-theorem-and-irrational-numbers
Course Challenge: Practice Test
https://www.khanacademy.org/math/8th-grade-illustrative-math/test/subject-challenge?modal=1
Unit One: Rigid Transformations and Congruence
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-1-rigid-transformations-and-congruence
Unit Two: Dilations, Similarity, and Introducing Slope
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-2-dilations-similarity-and-introducing-slope
Unit Three: Linear Relationships
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-3-linear-relationships
Unit Four: Linear Equations and Linear Systems
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-3-linear-relationships
Unit Five: Functions and Volume
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-5-functions-and-volume
Unit Six: Associations in Data
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-6-associations-in-data
Unit Seven: Exponents and Scientific Notation
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-6-associations-in-data
Unit Eight: Pythagorean Theorem and Irrational Numbers
https://www.khanacademy.org/math/8th-grade-illustrative-math/unit-8-pythagorean-theorem-and-irrational-numbers
Course Challenge: Practice Test
https://www.khanacademy.org/math/8th-grade-illustrative-math/test/subject-challenge?modal=1