Use the commutative property of multiplication to write a related number sentence 4x9=36

4x9=9x4 both equals 36

Well, the commutative property is that a multiplication problem will answer the same if the two factors are reversed. I'm not sure exactly what they mean, but I'm assuming they mean for you to write something like 4*9=36=9*4, which demonstrates this property.

Good Luck!