No problem, we've got 6420 and 7839 to multiply
6420 × 7839 = 7839 × (6420)
+ 7839 × 0 yielding 0
+ 7839 × 20 resulting in 156780
+ 7839 × 400 that is equal 3135600
+ 7839 × 6000 giving us 47034000

= 50326380
