Alright, let's work through 6090 times 665 step by step
6090 × 665 = 665 × (6090)
+ 665 × 0 that results in 0
+ 665 × 90 that equals 59850
+ 665 × 000 which equals 0
+ 665 × 6000 giving us 3990000

= 4049850
