Alright, let's work through 6927 times 3521 step by step
6927 × 3521 = 3521 × (6927)
+ 3521 × 7 giving us 24647
+ 3521 × 20 producing 70420
+ 3521 × 900 what gives us 3168900
+ 3521 × 6000 that is equal 21126000

= 24389967
