No problem, we've got 7872 and 1580 to multiply
7872 × 1580 = 1580 × (7872)
+ 1580 × 2 that is equal 3160
+ 1580 × 70 resulting in 110600
+ 1580 × 800 what gives us 1264000
+ 1580 × 7000 giving us 11060000

= 12437760
