No problem, we've got 1251 and 5421 to multiply
1251 × 5421 = 5421 × (1251)
+ 5421 × 1 that equals 5421
+ 5421 × 50 that is equal 271050
+ 5421 × 200 resulting in 1084200
+ 5421 × 1000 that results in 5421000

= 6781671
