Alright, let's work through 5211 times 2381 step by step
5211 × 2381 = 2381 × (5211)
+ 2381 × 1 what gives us 2381
+ 2381 × 10 which equals 23810
+ 2381 × 200 that equals 476200
+ 2381 × 5000 that is equal 11905000

= 12407391
