( 6 + 6 ) + ( 6 + 8 ) + ( 5 + 8 ) = 39
6 plus 7 plus 8 equals 6 plus 8 plus 7, what property is that?That is the associative property.
8+8+8+6+6+16 =52 All the addition can happen in the same step. When the operations are all the same you can do this.
6 + 6 + 8 + 3 = 23
28
If you mean: 6*(7+8)*(6+7)+8 then it works out as 1178
8 + 8 + 6 + 3 + 4 + 3 = 32
22! 8 + 8 is 16 + 6 = 22
120
8 plus 7 is 15. 15 plus 6 is 21. :)
Of course it is. 6+8=14, 8+6=14. This is the commutative property of addition.
9 + 6 + 9 + 6 + 9 + 8 + 5 + 2 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 99