No problem, we've got 1389 and 8534 to multiply
1389 × 8534 = 8534 × (1389)
+ 8534 × 9 what gives us 76806
+ 8534 × 80 that equals 682720
+ 8534 × 300 giving us 2560200
+ 8534 × 1000 giving us 8534000

= 11853726
