Topic A: The properties of multiplication and division

Topic A includes lessons 1-3. "Study commutativity to find known facts of 6, 7, 8, and 9. Apply the distributive and commutative properties to relate multiplication facts 5 × n + n to 6 × n and n × 6 where n is the size of the unit. Multiply and divide with familiar facts using a letter to represent the unknown." Eureka Math/EngageNY (c) 2015 GreatMinds.org