Alright, let's work through 1989 times 7735 step by step
1989 × 7735 = 7735 × (1989)
+ 7735 × 9 yielding 69615
+ 7735 × 80 resulting in 618800
+ 7735 × 900 yielding 6961500
+ 7735 × 1000 giving us 7735000

= 15384915
