Alright, let's work through 5780 times 7889 step by step
5780 × 7889 = 7889 × (5780)
+ 7889 × 0 producing 0
+ 7889 × 80 that equals 631120
+ 7889 × 700 that is equal 5522300
+ 7889 × 5000 which equals 39445000

= 45598420
