Alright, let's work through 7989 times 9828 step by step
7989 × 9828 = 9828 × (7989)
+ 9828 × 9 resulting in 88452
+ 9828 × 80 resulting in 786240
+ 9828 × 900 yielding 8845200
+ 9828 × 7000 yielding 68796000

= 78515892
