few errors in your title: 2 plus 4 = 6 6 plus 9 = 15 10 plus 25 = 35 18 + 81 = 99
The commutative property.
-9
No! It equals 15, but 9-6=3.
25
25
Anton Heinrich Springer?
Yes, 9+6 is 15.
24 24 + (-15) = 9
-9
-3
1+9+25=35 not 41, this is a false statement