No problem, we've got 6390 and 4215 to multiply
6390 × 4215 = 4215 × (6390)
+ 4215 × 0 resulting in 0
+ 4215 × 90 that equals 379350
+ 4215 × 300 giving us 1264500
+ 4215 × 6000 producing 25290000

= 26933850
