Alright, let's work through 42300628 times 6630721 step by step
42300628 × 6630721 = 6630721 × (42300628)
+ 6630721 × 8 what gives us 53045768
+ 6630721 × 20 producing 132614420
+ 6630721 × 600 what gives us 3978432600
+ 6630721 × 0000 producing 0
+ 6630721 × 00000 which equals 0
+ 6630721 × 300000 that results in 1989216300000
+ 6630721 × 2000000 producing 13261442000000
+ 6630721 × 40000000 that is equal 265228840000000

= 280483662392788
