Alright, let's work through 1020 times 5646 step by step
1020 × 5646 = 5646 × (1020)
+ 5646 × 0 that is equal 0
+ 5646 × 20 giving us 112920
+ 5646 × 000 producing 0
+ 5646 × 1000 that is equal 5646000

= 5758920
