728×101
101 can be represented as (100 +1), as calculations with 100 (or any power of 10) makes it easier and faster.
Now using the distributive property,
a×(b+c) = (a×b) + (a×c), we get,
728×101=728×(100+1)
= (728×100)+(728×1)
= 72800+728
= 73528