How can the associative property be used to mentally find 48 plus 82

Flip the numbers. so instead it would be 82 + 48

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .