Alright, let's work through 1805 times 2236 step by step
1805 × 2236 = 2236 × (1805)
+ 2236 × 5 resulting in 11180
+ 2236 × 00 what gives us 0
+ 2236 × 800 producing 1788800
+ 2236 × 1000 which equals 2236000

= 4035980
