Question

Use the commutative property of multiplication to write a related number sentence 4×5=20

Answer 1

Do you mean 4 x 5=20 turns into 5 x 4=20 or do you mean like 6 x 7=42

Answer 2

5x4=20 commutative property tells us we can commute or swish numbers that we multiply around and the answers will be the same.

If you get 5 four times or 4 five times you still got 20 in both cases.