Alright, let's work through 9837 times 7980 step by step
9837 × 7980 = 7980 × (9837)
+ 7980 × 7 that is equal 55860
+ 7980 × 30 yielding 239400
+ 7980 × 800 producing 6384000
+ 7980 × 9000 that is equal 71820000

= 78499260
