No problem, we've got 3107 and 1245 to multiply
3107 × 1245 = 1245 × (3107)
+ 1245 × 7 that is equal 8715
+ 1245 × 00 which equals 0
+ 1245 × 100 producing 124500
+ 1245 × 3000 resulting in 3735000

= 3868215
