No problem, we've got 6108 and 8439 to multiply
6108 × 8439 = 8439 × (6108)
+ 8439 × 8 that is equal 67512
+ 8439 × 00 what gives us 0
+ 8439 × 100 that equals 843900
+ 8439 × 6000 yielding 50634000

= 51545412
