No problem, we've got 3091 and 6819 to multiply
3091 × 6819 = 6819 × (3091)
+ 6819 × 1 what gives us 6819
+ 6819 × 90 that equals 613710
+ 6819 × 000 that is equal 0
+ 6819 × 3000 that is equal 20457000

= 21077529
