Alright, let's work through 1100 times 6400 step by step
1100 × 6400 = 6400 × (1100)
+ 6400 × 0 what gives us 0
+ 6400 × 00 giving us 0
+ 6400 × 100 what gives us 640000
+ 6400 × 1000 which equals 6400000

= 7040000
