Multiple choice How much is ( 140 x 140 ) - ( 139 x 139)? 19600 19460 297 279 1 Reveal answer Fill a bubble to check yourself D Correct answer Explanation This is the right answer. If we multiply both figures and the subtract it we will get 279. 140 x 140 = 19600 139 x 139 = 19321So, 19600- 19321 = 279.