Alright, let's work through 6807 times 755 step by step
6807 × 755 = 755 × (6807)
+ 755 × 7 that is equal 5285
+ 755 × 00 giving us 0
+ 755 × 800 which equals 604000
+ 755 × 6000 which equals 4530000

= 5139285
