Alright, let's work through 3199 times 135 step by step
3199 × 135 = 135 × (3199)
+ 135 × 9 giving us 1215
+ 135 × 90 what gives us 12150
+ 135 × 100 giving us 13500
+ 135 × 3000 that is equal 405000

= 431865
