Let's calculate 9840 x 8398
9840 × 8398 = 8398 × (9840)
+ 8398 × 0 which equals 0
+ 8398 × 40 that is equal 335920
+ 8398 × 800 resulting in 6718400
+ 8398 × 9000 that results in 75582000

= 82636320
