Alright, let's work through 3381 times 81 step by step
3381 × 81 = 81 × (3381)
+ 81 × 1 yielding 81
+ 81 × 80 what gives us 6480
+ 81 × 300 what gives us 24300
+ 81 × 3000 that equals 243000

= 273861
