WHAT DO YOU MEAN BY ASSOCIATIVE UNDER ADDITION.
Kindly refer the similar link for your query.
https://www.meritnation.com/cbse-class-7/math/math/integers/studymaterial/9_1_3_31_7946
Regards
https://www.meritnation.com/cbse-class-7/math/math/integers/studymaterial/9_1_3_31_7946
Regards