We're going to solve 1991 multiplied by 6408
1991 × 6408 = 6408 × (1991)
+ 6408 × 1 producing 6408
+ 6408 × 90 that equals 576720
+ 6408 × 900 that is equal 5767200
+ 6408 × 1000 yielding 6408000

= 12758328
