Alright, let's work through 6640 times 4920 step by step
6640 × 4920 = 4920 × (6640)
+ 4920 × 0 what gives us 0
+ 4920 × 40 that is equal 196800
+ 4920 × 600 producing 2952000
+ 4920 × 6000 that is equal 29520000

= 32668800
