No problem, we've got 1380 and 3150 to multiply
1380 × 3150 = 3150 × (1380)
+ 3150 × 0 what gives us 0
+ 3150 × 80 which equals 252000
+ 3150 × 300 producing 945000
+ 3150 × 1000 that results in 3150000

= 4347000
