What is breaking apart of 6x6

Breaking apart 6x6 is useless. It's already broken apart. The  breaking apart method is used to multiply larger numbers, in your head. Like 160 x 4

Break apart the larger number into a set of addends that sums up to 160. 100 and 60 are addends.
Multiply both numbers by the multiplier ( 4 )
(You can even break down the 60 into something smaller)
Add up both of the products to get your final answer.