Understanding commutativity

Maths

Choose the most efficient way to add eight and two together.

Choose the equation that is equal to 4 + 2

In the picture 5 sheep are in the field, 2 are outside the field. Which is the most efficient equation to represent this problem?

In the picture there are 5 orange fish and 4 blue fish. Which equation could we use to represent this?

In the picture 5 sheep are in the field, 2 are outside the field. Which equation could we use to represent this?

I have 3 green apples and 2 red apples. How could I represent my apples as an addition equation?