No problem, we've got 6420 and 4435 to multiply
6420 × 4435 = 4435 × (6420)
+ 4435 × 0 what gives us 0
+ 4435 × 20 that is equal 88700
+ 4435 × 400 that results in 1774000
+ 4435 × 6000 what gives us 26610000

= 28472700
