first you start with the positive so since its going from Highest to Lowest the positive would always come first, So you would start with 25 since its your highest number and then get to 20. Now the negatives are the same just with the Negative (-) sign, so just do it like how you would with the positive numbers by counting up so first would be -10 and then your next one.
The identity property means that whatever you put in is whatever comes out. Notice that if we multiply 1 with any number, we get that number back. So multiplying by 1 is the identity property of multiplication.
