Let's calculate 8420 x 8648
8420 × 8648 = 8648 × (8420)
+ 8648 × 0 resulting in 0
+ 8648 × 20 which equals 172960
+ 8648 × 400 that is equal 3459200
+ 8648 × 8000 that results in 69184000

= 72816160
