We're going to solve 6390 multiplied by 1260
6390 × 1260 = 1260 × (6390)
+ 1260 × 0 what gives us 0
+ 1260 × 90 giving us 113400
+ 1260 × 300 giving us 378000
+ 1260 × 6000 what gives us 7560000

= 8051400
