No problem, we've got 3340 and 643 to multiply
3340 × 643 = 643 × (3340)
+ 643 × 0 that is equal 0
+ 643 × 40 that results in 25720
+ 643 × 300 what gives us 192900
+ 643 × 3000 giving us 1929000

= 2147620
