Alright, let's work through 7072 times 770 step by step
7072 × 770 = 770 × (7072)
+ 770 × 2 that is equal 1540
+ 770 × 70 which equals 53900
+ 770 × 000 which equals 0
+ 770 × 7000 which equals 5390000

= 5445440
