Alright, let's work through 1105 times 1639 step by step
1105 × 1639 = 1639 × (1105)
+ 1639 × 5 giving us 8195
+ 1639 × 00 producing 0
+ 1639 × 100 yielding 163900
+ 1639 × 1000 resulting in 1639000

= 1811095
