No problem, we've got 8428 and 9828 to multiply
8428 × 9828 = 9828 × (8428)
+ 9828 × 8 yielding 78624
+ 9828 × 20 producing 196560
+ 9828 × 400 that is equal 3931200
+ 9828 × 8000 that is equal 78624000

= 82830384
