No problem, we've got 6681 and 5998 to multiply
6681 × 5998 = 5998 × (6681)
+ 5998 × 1 which equals 5998
+ 5998 × 80 that is equal 479840
+ 5998 × 600 what gives us 3598800
+ 5998 × 6000 giving us 35988000

= 40072638
