0 +16 = 16+ 0 <<< what property is this?

commutativity

is the property that changing the order of the operands of an operation does not change the result of the operation.

commutative property?

Commutative property is correct also.

thank you

You're welcome!

The property being demonstrated in this equation is the commutative property of addition. According to this property, the order in which numbers are added does not affect the result. In other words, when adding two numbers, you can switch their places without changing the sum.

To understand why this is the commutative property, we can break down the equation:

0 + 16 = 16 + 0

On the left-hand side, we have 0 being added to 16, which gives us 16 as the sum. On the right-hand side, we have 16 being added to 0, which also gives us 16 as the sum. The numbers being added are the same, but their positions are switched, yet the result remains unchanged. This is the essence of the commutative property of addition.