https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/properties-of-numbers/a/properties-of-addition 2023-12-11T22:10:22.66384181Z Properties of addition Explore the commutative, associative, and identity properties of addition. article https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/properties-of-numbers/a/properties-of-multiplication 2021-06-28T22:10:45Z Properties of multiplication Explore the commutative, associative, and identity properties of multiplication. article